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 /* Check configured servers and established links */
717 /* Look for non-empty read buffers ... */
718 for (i = 0; i < Pool_Size; i++) {
719 if ((My_Connections[i].sock > NONE)
720 && (array_bytes(&My_Connections[i].rbuf) > 0)
721 && (My_Connections[i].delaytime <= t)) {
722 /* ... and try to handle the received data */
723 bytes_processed = Handle_Buffer(i);
724 /* if we processed data, and there might be
725 * more commands in the input buffer, do not
726 * try to read any more data now */
727 if (bytes_processed &&
728 array_bytes(&My_Connections[i].rbuf) > 2) {
730 ("Throttling connection %d: command limit reached!",
732 Conn_SetPenalty(i, 1);
737 /* Look for non-empty write buffers ... */
738 for (i = 0; i < Pool_Size; i++) {
739 if (My_Connections[i].sock <= NONE)
742 wdatalen = (unsigned int)array_bytes(&My_Connections[i].wbuf);
745 array_bytes(&My_Connections[i].zip.wbuf) > 0)
750 if (SSL_WantRead(&My_Connections[i]))
752 io_event_add(My_Connections[i].sock,
757 /* Check from which sockets we possibly could read ... */
758 for (i = 0; i < Pool_Size; i++) {
759 if (My_Connections[i].sock <= NONE)
762 if (SSL_WantWrite(&My_Connections[i]))
763 continue; /* TLS/SSL layer needs to write data; deal with this first */
765 if (Proc_InProgress(&My_Connections[i].proc_stat)) {
766 /* Wait for completion of forked subprocess
767 * and ignore the socket in the meantime ... */
768 io_event_del(My_Connections[i].sock,
773 if (Conn_OPTION_ISSET(&My_Connections[i], CONN_ISCONNECTING))
774 /* Wait for completion of connect() ... */
777 if (My_Connections[i].delaytime > t) {
778 /* There is a "penalty time" set: ignore socket! */
779 io_event_del(My_Connections[i].sock,
784 io_event_add(My_Connections[i].sock, IO_WANTREAD);
787 /* Set the timeout for reading from the network to 1 second,
788 * which is the granularity with witch we handle "penalty
789 * times" for example.
790 * Note: tv_sec/usec are undefined(!) after io_dispatch()
791 * returns, so we have to set it beforce each call to it! */
795 /* Wait for activity ... */
796 i = io_dispatch(&tv);
797 if (i == -1 && errno != EINTR) {
798 Log(LOG_EMERG, "Conn_Handler(): io_dispatch(): %s!",
800 Log(LOG_ALERT, "%s exiting due to fatal errors!",
806 if (NGIRCd_SignalQuit)
807 Log(LOG_NOTICE | LOG_snotice, "Server going down NOW!");
808 else if (NGIRCd_SignalRestart)
809 Log(LOG_NOTICE | LOG_snotice, "Server restarting NOW!");
814 * Write a text string into the socket of a connection.
815 * This function automatically appends CR+LF to the string and validates that
816 * the result is a valid IRC message (oversized messages are shortened, for
817 * example). Then it calls the Conn_Write() function to do the actual sending.
818 * @param Idx Index fo the connection.
819 * @param Format Format string, see printf().
820 * @return true on success, false otherwise.
824 Conn_WriteStr(CONN_ID Idx, const char *Format, ...)
827 Conn_WriteStr(Idx, Format, va_alist)
833 char buffer[COMMAND_LEN];
838 assert( Idx > NONE );
839 assert( Format != NULL );
842 va_start( ap, Format );
846 if (vsnprintf( buffer, COMMAND_LEN - 2, Format, ap ) >= COMMAND_LEN - 2 ) {
848 * The string that should be written to the socket is longer
849 * than the allowed size of COMMAND_LEN bytes (including both
850 * the CR and LF characters). This can be caused by the
851 * IRC_WriteXXX() functions when the prefix of this server had
852 * to be added to an already "quite long" command line which
853 * has been received from a regular IRC client, for example.
855 * We are not allowed to send such "oversized" messages to
856 * other servers and clients, see RFC 2812 2.3 and 2813 3.3
857 * ("these messages SHALL NOT exceed 512 characters in length,
858 * counting all characters including the trailing CR-LF").
860 * So we have a big problem here: we should send more bytes
861 * to the network than we are allowed to and we don't know
862 * the originator (any more). The "old" behaviour of blaming
863 * the receiver ("next hop") is a bad idea (it could be just
864 * an other server only routing the message!), so the only
865 * option left is to shorten the string and to hope that the
866 * result is still somewhat useful ...
870 strcpy (buffer + sizeof(buffer) - strlen(CUT_TXTSUFFIX) - 2 - 1,
876 Log(LOG_DEBUG, " -> connection %d: '%s'.", Idx, buffer);
879 len = strlcat( buffer, "\r\n", sizeof( buffer ));
880 ok = Conn_Write(Idx, buffer, len);
881 My_Connections[Idx].msg_out++;
885 } /* Conn_WriteStr */
889 * Append Data to the outbound write buffer of a connection.
890 * @param Idx Index of the connection.
891 * @param Data pointer to the data.
892 * @param Len length of Data.
893 * @return true on success, false otherwise.
896 Conn_Write( CONN_ID Idx, char *Data, size_t Len )
899 size_t writebuf_limit = WRITEBUFFER_LEN;
900 assert( Idx > NONE );
901 assert( Data != NULL );
904 c = Conn_GetClient(Idx);
907 /* Servers do get special write buffer limits, so they can generate
908 * all the messages that are required while peering. */
909 if (Client_Type(c) == CLIENT_SERVER)
910 writebuf_limit = WRITEBUFFER_SLINK_LEN;
912 /* Is the socket still open? A previous call to Conn_Write()
913 * may have closed the connection due to a fatal error.
914 * In this case it is sufficient to return an error, as well. */
915 if( My_Connections[Idx].sock <= NONE ) {
916 LogDebug("Skipped write on closed socket (connection %d).", Idx);
921 if ( Conn_OPTION_ISSET( &My_Connections[Idx], CONN_ZIP )) {
923 * Zip_Buffer() does all the dirty work for us: it flushes
924 * the (pre-)compression buffers if required and handles
925 * all error conditions. */
926 if (!Zip_Buffer(Idx, Data, Len))
932 /* Uncompressed link:
933 * Check if outbound buffer has enough space for the data. */
934 if (array_bytes(&My_Connections[Idx].wbuf) + Len >=
936 /* Buffer is full, flush it. Handle_Write deals with
937 * low-level errors, if any. */
938 if (!Handle_Write(Idx))
942 /* When the write buffer is still too big after flushing it,
943 * the connection will be killed. */
944 if (array_bytes(&My_Connections[Idx].wbuf) + Len >=
947 "Write buffer overflow (connection %d, size %lu byte)!",
949 (unsigned long)array_bytes(&My_Connections[Idx].wbuf));
950 Conn_Close(Idx, "Write buffer overflow!", NULL, false);
954 /* Copy data to write buffer */
955 if (!array_catb(&My_Connections[Idx].wbuf, Data, Len))
958 My_Connections[Idx].bytes_out += Len;
961 /* Adjust global write counter */
969 Conn_Close( CONN_ID Idx, const char *LogMsg, const char *FwdMsg, bool InformClient )
971 /* Close connection. Open pipes of asyncronous resolver
972 * sub-processes are closed down. */
978 double in_z_k, out_z_k;
982 assert( Idx > NONE );
984 /* Is this link already shutting down? */
985 if( Conn_OPTION_ISSET( &My_Connections[Idx], CONN_ISCLOSING )) {
986 /* Conn_Close() has been called recursively for this link;
987 * probabe reason: Handle_Write() failed -- see below. */
988 LogDebug("Recursive request to close connection: %d", Idx );
992 assert( My_Connections[Idx].sock > NONE );
994 /* Mark link as "closing" */
995 Conn_OPTION_ADD( &My_Connections[Idx], CONN_ISCLOSING );
997 port = ng_ipaddr_getport(&My_Connections[Idx].addr);
998 Log(LOG_INFO, "Shutting down connection %d (%s) with %s:%d ...", Idx,
999 LogMsg ? LogMsg : FwdMsg, My_Connections[Idx].host, port);
1001 /* Search client, if any */
1002 c = Conn_GetClient( Idx );
1004 /* Should the client be informed? */
1007 /* Send statistics to client if registered as user: */
1008 if ((c != NULL) && (Client_Type(c) == CLIENT_USER)) {
1010 ":%s NOTICE %s :%sConnection statistics: client %.1f kb, server %.1f kb.",
1011 Client_ID(Client_ThisServer()), Client_ID(c),
1013 (double)My_Connections[Idx].bytes_in / 1024,
1014 (double)My_Connections[Idx].bytes_out / 1024);
1017 /* Send ERROR to client (see RFC 2812, section 3.1.7) */
1019 Conn_WriteStr(Idx, "ERROR :%s", FwdMsg);
1021 Conn_WriteStr(Idx, "ERROR :Closing connection.");
1024 /* Try to write out the write buffer. Note: Handle_Write() eventually
1025 * removes the CLIENT structure associated with this connection if an
1026 * error occurs! So we have to re-check if there is still an valid
1027 * CLIENT structure after calling Handle_Write() ...*/
1028 (void)Handle_Write( Idx );
1030 /* Search client, if any (re-check!) */
1031 c = Conn_GetClient( Idx );
1033 if ( Conn_OPTION_ISSET( &My_Connections[Idx], CONN_SSL )) {
1034 Log(LOG_INFO, "SSL connection %d shutting down ...", Idx);
1035 ConnSSL_Free(&My_Connections[Idx]);
1038 /* Shut down socket */
1039 if (! io_close(My_Connections[Idx].sock)) {
1040 /* Oops, we can't close the socket!? This is ... ugly! */
1042 "Error closing connection %d (socket %d) with %s:%d - %s! (ignored)",
1043 Idx, My_Connections[Idx].sock, My_Connections[Idx].host,
1044 port, strerror(errno));
1047 /* Mark socket as invalid: */
1048 My_Connections[Idx].sock = NONE;
1050 /* If there is still a client, unregister it now */
1052 Client_Destroy(c, LogMsg, FwdMsg, true);
1054 /* Calculate statistics and log information */
1055 in_k = (double)My_Connections[Idx].bytes_in / 1024;
1056 out_k = (double)My_Connections[Idx].bytes_out / 1024;
1058 if (Conn_OPTION_ISSET( &My_Connections[Idx], CONN_ZIP)) {
1059 in_z_k = (double)My_Connections[Idx].zip.bytes_in / 1024;
1060 out_z_k = (double)My_Connections[Idx].zip.bytes_out / 1024;
1061 /* Make sure that no division by zero can occur during
1062 * the calculation of in_p and out_p: in_z_k and out_z_k
1063 * are non-zero, that's guaranteed by the protocol until
1064 * compression can be enabled. */
1069 in_p = (int)(( in_k * 100 ) / in_z_k );
1070 out_p = (int)(( out_k * 100 ) / out_z_k );
1072 "Connection %d with %s:%d closed (in: %.1fk/%.1fk/%d%%, out: %.1fk/%.1fk/%d%%).",
1073 Idx, My_Connections[Idx].host, port,
1074 in_k, in_z_k, in_p, out_k, out_z_k, out_p);
1080 "Connection %d with %s:%d closed (in: %.1fk, out: %.1fk).",
1081 Idx, My_Connections[Idx].host, port,
1085 /* Servers: Modify time of next connect attempt? */
1086 Conf_UnsetServer( Idx );
1089 /* Clean up zlib, if link was compressed */
1090 if ( Conn_OPTION_ISSET( &My_Connections[Idx], CONN_ZIP )) {
1091 inflateEnd( &My_Connections[Idx].zip.in );
1092 deflateEnd( &My_Connections[Idx].zip.out );
1093 array_free(&My_Connections[Idx].zip.rbuf);
1094 array_free(&My_Connections[Idx].zip.wbuf);
1098 array_free(&My_Connections[Idx].rbuf);
1099 array_free(&My_Connections[Idx].wbuf);
1101 /* Clean up connection structure (=free it) */
1102 Init_Conn_Struct( Idx );
1104 assert(NumConnections > 0);
1107 LogDebug("Shutdown of connection %d completed, %ld connection%s left.",
1108 Idx, NumConnections, NumConnections != 1 ? "s" : "");
1115 return NumConnections;
1122 return NumConnectionsMax;
1123 } /* Conn_CountMax */
1127 Conn_CountAccepted(void)
1129 return NumConnectionsAccepted;
1130 } /* Conn_CountAccepted */
1134 * Synchronize established connections and configured server structures
1135 * after a configuration update and store the correct connection IDs, if any.
1138 Conn_SyncServerStruct(void)
1144 for (i = 0; i < Pool_Size; i++) {
1145 if (My_Connections[i].sock == NONE)
1149 client = Conn_GetClient(i);
1150 if (!client || Client_Type(client) != CLIENT_SERVER)
1153 for (c = 0; c < MAX_SERVERS; c++) {
1154 /* Configured server? */
1155 if (!Conf_Server[c].host[0])
1158 if (strcasecmp(Conf_Server[c].name, Client_ID(client)) == 0)
1159 Conf_Server[c].conn_id = i;
1162 } /* SyncServerStruct */
1166 * Send out data of write buffer; connect new sockets.
1169 Handle_Write( CONN_ID Idx )
1174 assert( Idx > NONE );
1175 if ( My_Connections[Idx].sock < 0 ) {
1176 LogDebug("Handle_Write() on closed socket, connection %d", Idx);
1179 assert( My_Connections[Idx].sock > NONE );
1181 wdatalen = array_bytes(&My_Connections[Idx].wbuf );
1184 if (wdatalen == 0) {
1185 /* Write buffer is empty, so we try to flush the compression
1186 * buffer and get some data to work with from there :-) */
1187 if (!Zip_Flush(Idx))
1190 /* Now the write buffer most probably has changed: */
1191 wdatalen = array_bytes(&My_Connections[Idx].wbuf);
1195 if (wdatalen == 0) {
1196 /* Still no data, fine. */
1197 io_event_del(My_Connections[Idx].sock, IO_WANTWRITE );
1202 ("Handle_Write() called for connection %d, %ld bytes pending ...",
1206 if ( Conn_OPTION_ISSET( &My_Connections[Idx], CONN_SSL )) {
1207 len = ConnSSL_Write(&My_Connections[Idx], array_start(&My_Connections[Idx].wbuf), wdatalen);
1211 len = write(My_Connections[Idx].sock,
1212 array_start(&My_Connections[Idx].wbuf), wdatalen );
1215 if (errno == EAGAIN || errno == EINTR)
1218 Log(LOG_ERR, "Write error on connection %d (socket %d): %s!",
1219 Idx, My_Connections[Idx].sock, strerror(errno));
1220 Conn_Close(Idx, "Write error!", NULL, false);
1224 /* move any data not yet written to beginning */
1225 array_moveleft(&My_Connections[Idx].wbuf, 1, (size_t)len);
1228 } /* Handle_Write */
1232 Count_Connections(ng_ipaddr_t *a)
1237 for (i = 0; i < Pool_Size; i++) {
1238 if (My_Connections[i].sock <= NONE)
1240 if (ng_ipaddr_ipequal(&My_Connections[i].addr, a))
1244 } /* Count_Connections */
1248 * Initialize new client connection on a listening socket.
1249 * @param Sock Listening socket descriptor
1250 * @return Accepted socket descriptor or -1 on error
1253 New_Connection(int Sock)
1256 struct request_info req;
1258 ng_ipaddr_t new_addr;
1259 char ip_str[NG_INET_ADDRSTRLEN];
1260 int new_sock, new_sock_len, identsock;
1264 assert(Sock > NONE);
1266 new_sock_len = (int)sizeof(new_addr);
1267 new_sock = accept(Sock, (struct sockaddr *)&new_addr,
1268 (socklen_t *)&new_sock_len);
1270 Log(LOG_CRIT, "Can't accept connection: %s!", strerror(errno));
1273 NumConnectionsAccepted++;
1275 if (!ng_ipaddr_tostr_r(&new_addr, ip_str)) {
1276 Log(LOG_CRIT, "fd %d: Can't convert IP address!", new_sock);
1277 Simple_Message(new_sock, "ERROR :Internal Server Error");
1283 /* Validate socket using TCP Wrappers */
1284 request_init(&req, RQ_DAEMON, PACKAGE_NAME, RQ_FILE, new_sock,
1285 RQ_CLIENT_SIN, &new_addr, NULL);
1287 if (!hosts_access(&req)) {
1289 "Refused connection from %s (by TCP Wrappers)!", ip_str);
1290 Simple_Message(new_sock, "ERROR :Connection refused");
1296 if (!Init_Socket(new_sock))
1299 /* Check global connection limit */
1300 if ((Conf_MaxConnections > 0) &&
1301 (NumConnections >= (size_t) Conf_MaxConnections)) {
1302 Log(LOG_ALERT, "Can't accept connection: limit (%d) reached!",
1303 Conf_MaxConnections);
1304 Simple_Message(new_sock, "ERROR :Connection limit reached");
1309 /* Check IP-based connection limit */
1310 cnt = Count_Connections(&new_addr);
1311 if ((Conf_MaxConnectionsIP > 0) && (cnt >= Conf_MaxConnectionsIP)) {
1312 /* Access denied, too many connections from this IP address! */
1314 "Refused connection from %s: too may connections (%ld) from this IP address!",
1316 Simple_Message(new_sock,
1317 "ERROR :Connection refused, too many connections from your IP address!");
1322 if (new_sock >= Pool_Size) {
1323 if (!array_alloc(&My_ConnArray, sizeof(CONNECTION),
1324 (size_t) new_sock)) {
1326 "Can't allocate memory! [New_Connection]");
1327 Simple_Message(new_sock, "ERROR: Internal error");
1331 LogDebug("Bumped connection pool to %ld items (internal: %ld items, %ld bytes)",
1332 new_sock, array_length(&My_ConnArray,
1333 sizeof(CONNECTION)), array_bytes(&My_ConnArray));
1335 /* Adjust pointer to new block */
1336 My_Connections = array_start(&My_ConnArray);
1337 while (Pool_Size <= new_sock)
1338 Init_Conn_Struct(Pool_Size++);
1341 /* register callback */
1342 if (!io_event_create(new_sock, IO_WANTREAD, cb_clientserver)) {
1344 "Can't accept connection: io_event_create failed!");
1345 Simple_Message(new_sock, "ERROR :Internal error");
1350 c = Client_NewLocal(new_sock, ip_str, CLIENT_UNKNOWN, false);
1353 "Can't accept connection: can't create client structure!");
1354 Simple_Message(new_sock, "ERROR :Internal error");
1359 Init_Conn_Struct(new_sock);
1360 My_Connections[new_sock].sock = new_sock;
1361 My_Connections[new_sock].addr = new_addr;
1362 My_Connections[new_sock].client = c;
1364 /* Set initial hostname to IP address. This becomes overwritten when
1365 * the DNS lookup is enabled and succeeds, but is used otherwise. */
1366 if (ng_ipaddr_af(&new_addr) != AF_INET)
1367 snprintf(My_Connections[new_sock].host,
1368 sizeof(My_Connections[new_sock].host), "[%s]", ip_str);
1370 strlcpy(My_Connections[new_sock].host, ip_str,
1371 sizeof(My_Connections[new_sock].host));
1373 Client_SetHostname(c, My_Connections[new_sock].host);
1375 Log(LOG_INFO, "Accepted connection %d from %s:%d on socket %d.",
1376 new_sock, My_Connections[new_sock].host,
1377 ng_ipaddr_getport(&new_addr), Sock);
1379 identsock = new_sock;
1385 Resolve_Addr(&My_Connections[new_sock].proc_stat, &new_addr,
1386 identsock, cb_Read_Resolver_Result);
1388 Account_Connection();
1390 } /* New_Connection */
1394 Account_Connection(void)
1397 if (NumConnections > NumConnectionsMax)
1398 NumConnectionsMax = NumConnections;
1399 LogDebug("Total number of connections now %lu (max %lu).",
1400 NumConnections, NumConnectionsMax);
1401 } /* Account_Connection */
1405 Socket2Index( int Sock )
1407 assert( Sock >= 0 );
1409 if( Sock >= Pool_Size || My_Connections[Sock].sock != Sock ) {
1410 /* the Connection was already closed again, likely due to
1412 LogDebug("Socket2Index: can't get connection for socket %d!", Sock);
1416 } /* Socket2Index */
1420 * Read data from the network to the read buffer. If an error occures,
1421 * the socket of this connection will be shut down.
1424 Read_Request( CONN_ID Idx )
1427 static const unsigned int maxbps = COMMAND_LEN / 2;
1428 char readbuf[READBUFFER_LEN];
1431 assert( Idx > NONE );
1432 assert( My_Connections[Idx].sock > NONE );
1435 if ((array_bytes(&My_Connections[Idx].rbuf) >= READBUFFER_LEN) ||
1436 (array_bytes(&My_Connections[Idx].zip.rbuf) >= READBUFFER_LEN))
1438 if (array_bytes(&My_Connections[Idx].rbuf) >= READBUFFER_LEN)
1441 /* Read buffer is full */
1443 "Receive buffer overflow (connection %d): %d bytes!",
1444 Idx, array_bytes(&My_Connections[Idx].rbuf));
1445 Conn_Close( Idx, "Receive buffer overflow!", NULL, false );
1450 if (Conn_OPTION_ISSET(&My_Connections[Idx], CONN_SSL))
1451 len = ConnSSL_Read( &My_Connections[Idx], readbuf, sizeof(readbuf));
1454 len = read(My_Connections[Idx].sock, readbuf, sizeof(readbuf));
1456 Log(LOG_INFO, "%s:%u (%s) is closing the connection ...",
1457 My_Connections[Idx].host,
1458 (unsigned int) ng_ipaddr_getport(&My_Connections[Idx].addr),
1459 ng_ipaddr_tostr(&My_Connections[Idx].addr));
1461 "Socket closed!", "Client closed connection",
1467 if( errno == EAGAIN ) return;
1468 Log(LOG_ERR, "Read error on connection %d (socket %d): %s!",
1469 Idx, My_Connections[Idx].sock, strerror(errno));
1470 Conn_Close(Idx, "Read error!", "Client closed connection",
1475 if (Conn_OPTION_ISSET(&My_Connections[Idx], CONN_ZIP)) {
1476 if (!array_catb(&My_Connections[Idx].zip.rbuf, readbuf,
1479 "Could not append recieved data to zip input buffer (connn %d): %d bytes!",
1481 Conn_Close(Idx, "Receive buffer overflow!", NULL,
1488 if (!array_catb( &My_Connections[Idx].rbuf, readbuf, len)) {
1489 Log( LOG_ERR, "Could not append recieved data to input buffer (connn %d): %d bytes!", Idx, len );
1490 Conn_Close( Idx, "Receive buffer overflow!", NULL, false );
1494 /* Update connection statistics */
1495 My_Connections[Idx].bytes_in += len;
1497 /* Update timestamp of last data received if this connection is
1498 * registered as a user, server or service connection. Don't update
1499 * otherwise, so users have at least Conf_PongTimeout seconds time to
1500 * register with the IRC server -- see Check_Connections().
1501 * Update "lastping", too, if time shifted backwards ... */
1502 c = Conn_GetClient(Idx);
1503 if (c && (Client_Type(c) == CLIENT_USER
1504 || Client_Type(c) == CLIENT_SERVER
1505 || Client_Type(c) == CLIENT_SERVICE)) {
1507 if (My_Connections[Idx].lastdata != t)
1508 My_Connections[Idx].bps = 0;
1510 My_Connections[Idx].lastdata = t;
1511 if (My_Connections[Idx].lastping > t)
1512 My_Connections[Idx].lastping = t;
1515 /* Look at the data in the (read-) buffer of this connection */
1516 My_Connections[Idx].bps += Handle_Buffer(Idx);
1517 if (Client_Type(c) != CLIENT_SERVER
1518 && My_Connections[Idx].bps >= maxbps) {
1519 LogDebug("Throttling connection %d: BPS exceeded! (%u >= %u)",
1520 Idx, My_Connections[Idx].bps, maxbps);
1521 Conn_SetPenalty(Idx, 1);
1523 } /* Read_Request */
1527 * Handle all data in the connection read-buffer.
1528 * Data is processed until no complete command is left in the read buffer,
1529 * or MAX_COMMANDS[_SERVER] commands were processed.
1530 * When a fatal error occurs, the connection is shut down.
1531 * @param Idx Index of the connection.
1532 * @return number of bytes processed.
1535 Handle_Buffer(CONN_ID Idx)
1538 char *ptr1, *ptr2, *first_eol;
1546 unsigned int i, maxcmd = MAX_COMMANDS, len_processed = 0;
1549 c = Conn_GetClient(Idx);
1552 /* Servers do get special command limits, so they can process
1553 * all the messages that are required while peering. */
1554 if (Client_Type(c) == CLIENT_SERVER)
1555 maxcmd = MAX_COMMANDS_SERVER;
1557 starttime = time(NULL);
1558 for (i=0; i < maxcmd; i++) {
1560 if (My_Connections[Idx].delaytime > starttime)
1563 /* Unpack compressed data, if compression is in use */
1564 if (Conn_OPTION_ISSET(&My_Connections[Idx], CONN_ZIP)) {
1565 /* When unzipping fails, Unzip_Buffer() shuts
1566 * down the connection itself */
1567 if (!Unzip_Buffer(Idx))
1572 if (0 == array_bytes(&My_Connections[Idx].rbuf))
1575 /* Make sure that the buffer is NULL terminated */
1576 if (!array_cat0_temporary(&My_Connections[Idx].rbuf)) {
1577 Conn_Close(Idx, NULL,
1578 "Can't allocate memory [Handle_Buffer]",
1583 /* RFC 2812, section "2.3 Messages", 5th paragraph:
1584 * "IRC messages are always lines of characters terminated
1585 * with a CR-LF (Carriage Return - Line Feed) pair [...]". */
1587 ptr = strstr(array_start(&My_Connections[Idx].rbuf), "\r\n");
1590 /* Check for non-RFC-compliant request (only CR or LF)?
1591 * Unfortunately, there are quite a few clients out there
1592 * that do this -- e. g. mIRC, BitchX, and Trillian :-( */
1593 ptr1 = strchr(array_start(&My_Connections[Idx].rbuf), '\r');
1594 ptr2 = strchr(array_start(&My_Connections[Idx].rbuf), '\n');
1596 /* Check if there is a single CR or LF _before_ the
1597 * corerct CR+LF line terminator: */
1598 first_eol = ptr1 < ptr2 ? ptr1 : ptr2;
1599 if (first_eol < ptr) {
1600 /* Single CR or LF before CR+LF found */
1604 } else if (ptr1 || ptr2) {
1605 /* No CR+LF terminated command found, but single
1606 * CR or LF found ... */
1608 ptr = ptr1 < ptr2 ? ptr1 : ptr2;
1610 ptr = ptr1 ? ptr1 : ptr2;
1618 /* Complete (=line terminated) request found, handle it! */
1621 len = ptr - (char *)array_start(&My_Connections[Idx].rbuf) + delta;
1623 if (len > (COMMAND_LEN - 1)) {
1624 /* Request must not exceed 512 chars (incl. CR+LF!),
1625 * see RFC 2812. Disconnect Client if this happens. */
1627 "Request too long (connection %d): %d bytes (max. %d expected)!",
1628 Idx, array_bytes(&My_Connections[Idx].rbuf),
1630 Conn_Close(Idx, NULL, "Request too long", true);
1634 len_processed += (unsigned int)len;
1636 /* Request is empty (only '\r\n', '\r' or '\n');
1637 * delta is 2 ('\r\n') or 1 ('\r' or '\n'), see above */
1638 array_moveleft(&My_Connections[Idx].rbuf, 1, len);
1642 /* remember if stream is already compressed */
1643 old_z = My_Connections[Idx].options & CONN_ZIP;
1646 My_Connections[Idx].msg_in++;
1648 (Idx, (char *)array_start(&My_Connections[Idx].rbuf)))
1649 return 0; /* error -> connection has been closed */
1651 array_moveleft(&My_Connections[Idx].rbuf, 1, len);
1652 LogDebug("Connection %d: %d bytes left in read buffer.",
1653 Idx, array_bytes(&My_Connections[Idx].rbuf));
1655 if ((!old_z) && (My_Connections[Idx].options & CONN_ZIP) &&
1656 (array_bytes(&My_Connections[Idx].rbuf) > 0)) {
1657 /* The last command activated socket compression.
1658 * Data that was read after that needs to be copied
1659 * to the unzip buffer for decompression: */
1661 (&My_Connections[Idx].zip.rbuf,
1662 &My_Connections[Idx].rbuf)) {
1663 Conn_Close(Idx, NULL,
1664 "Can't allocate memory [Handle_Buffer]",
1669 array_trunc(&My_Connections[Idx].rbuf);
1671 ("Moved already received data (%u bytes) to uncompression buffer.",
1672 array_bytes(&My_Connections[Idx].zip.rbuf));
1676 return len_processed;
1677 } /* Handle_Buffer */
1681 * Check whether established connections are still alive or not.
1682 * If not, play PING-PONG first; and if that doesn't help either,
1683 * disconnect the respective peer.
1686 Check_Connections(void)
1692 for (i = 0; i < Pool_Size; i++) {
1693 if (My_Connections[i].sock < 0)
1696 c = Conn_GetClient(i);
1697 if (c && ((Client_Type(c) == CLIENT_USER)
1698 || (Client_Type(c) == CLIENT_SERVER)
1699 || (Client_Type(c) == CLIENT_SERVICE))) {
1700 /* connected User, Server or Service */
1701 if (My_Connections[i].lastping >
1702 My_Connections[i].lastdata) {
1703 /* We already sent a ping */
1704 if (My_Connections[i].lastping <
1705 time(NULL) - Conf_PongTimeout) {
1708 ("Connection %d: Ping timeout: %d seconds.",
1709 i, Conf_PongTimeout);
1710 snprintf(msg, sizeof(msg), "Ping timeout: %d seconds", Conf_PongTimeout);
1711 Conn_Close(i, NULL, msg, true);
1713 } else if (My_Connections[i].lastdata <
1714 time(NULL) - Conf_PingTimeout) {
1715 /* We need to send a PING ... */
1716 LogDebug("Connection %d: sending PING ...", i);
1717 My_Connections[i].lastping = time(NULL);
1718 Conn_WriteStr(i, "PING :%s",
1719 Client_ID(Client_ThisServer()));
1722 /* The connection is not fully established yet, so
1723 * we don't do the PING-PONG game here but instead
1724 * disconnect the client after "a short time" if it's
1725 * still not registered. */
1727 if (My_Connections[i].lastdata <
1728 time(NULL) - Conf_PongTimeout) {
1730 ("Unregistered connection %d timed out ...",
1732 Conn_Close(i, NULL, "Timeout", false);
1736 } /* Check_Connections */
1740 * Check if further server links should be established.
1748 time_now = time(NULL);
1750 /* Check all configured servers */
1751 for (i = 0; i < MAX_SERVERS; i++) {
1752 if (Conf_Server[i].conn_id != NONE)
1753 continue; /* Already establishing or connected */
1754 if (!Conf_Server[i].host[0] || !Conf_Server[i].port > 0)
1755 continue; /* No host and/or port configured */
1756 if (Conf_Server[i].flags & CONF_SFLAG_DISABLED)
1757 continue; /* Disabled configuration entry */
1758 if (Conf_Server[i].lasttry > (time_now - Conf_ConnectRetry))
1759 continue; /* We have to wait a little bit ... */
1761 /* Is there already a connection in this group? */
1762 if (Conf_Server[i].group > NONE) {
1763 for (n = 0; n < MAX_SERVERS; n++) {
1766 if ((Conf_Server[n].conn_id != NONE) &&
1767 (Conf_Server[n].group == Conf_Server[i].group))
1770 if (n < MAX_SERVERS)
1774 /* Okay, try to connect now */
1775 Conf_Server[i].lasttry = time_now;
1776 Conf_Server[i].conn_id = SERVER_WAIT;
1777 assert(Proc_GetPipeFd(&Conf_Server[i].res_stat) < 0);
1778 Resolve_Name(&Conf_Server[i].res_stat, Conf_Server[i].host,
1779 cb_Connect_to_Server);
1781 } /* Check_Servers */
1785 New_Server( int Server , ng_ipaddr_t *dest)
1787 /* Establish new server link */
1788 char ip_str[NG_INET_ADDRSTRLEN];
1789 int af_dest, res, new_sock;
1792 assert( Server > NONE );
1794 if (!ng_ipaddr_tostr_r(dest, ip_str)) {
1795 Log(LOG_WARNING, "New_Server: Could not convert IP to string");
1799 Log( LOG_INFO, "Establishing connection to \"%s\", %s, port %d ... ",
1800 Conf_Server[Server].host, ip_str, Conf_Server[Server].port );
1802 af_dest = ng_ipaddr_af(dest);
1803 new_sock = socket(af_dest, SOCK_STREAM, 0);
1805 Log( LOG_CRIT, "Can't create socket (af %d) : %s!", af_dest, strerror( errno ));
1809 if (!Init_Socket(new_sock))
1812 /* is a bind address configured? */
1813 res = ng_ipaddr_af(&Conf_Server[Server].bind_addr);
1814 /* if yes, bind now. If it fails, warn and let connect() pick a source address */
1815 if (res && bind(new_sock, (struct sockaddr *) &Conf_Server[Server].bind_addr,
1816 ng_ipaddr_salen(&Conf_Server[Server].bind_addr)))
1818 ng_ipaddr_tostr_r(&Conf_Server[Server].bind_addr, ip_str);
1819 Log(LOG_WARNING, "Can't bind socket to %s: %s!", ip_str, strerror(errno));
1821 ng_ipaddr_setport(dest, Conf_Server[Server].port);
1822 res = connect(new_sock, (struct sockaddr *) dest, ng_ipaddr_salen(dest));
1823 if(( res != 0 ) && ( errno != EINPROGRESS )) {
1824 Log( LOG_CRIT, "Can't connect socket: %s!", strerror( errno ));
1829 if (!array_alloc(&My_ConnArray, sizeof(CONNECTION), (size_t)new_sock)) {
1831 "Cannot allocate memory for server connection (socket %d)",
1837 My_Connections = array_start(&My_ConnArray);
1839 assert(My_Connections[new_sock].sock <= 0);
1841 Init_Conn_Struct(new_sock);
1843 ng_ipaddr_tostr_r(dest, ip_str);
1844 c = Client_NewLocal(new_sock, ip_str, CLIENT_UNKNOWNSERVER, false);
1846 Log( LOG_ALERT, "Can't establish connection: can't create client structure!" );
1851 /* Conn_Close() decrements this counter again */
1852 Account_Connection();
1853 Client_SetIntroducer( c, c );
1854 Client_SetToken( c, TOKEN_OUTBOUND );
1856 /* Register connection */
1857 Conf_Server[Server].conn_id = new_sock;
1858 My_Connections[new_sock].sock = new_sock;
1859 My_Connections[new_sock].addr = *dest;
1860 My_Connections[new_sock].client = c;
1861 strlcpy( My_Connections[new_sock].host, Conf_Server[Server].host,
1862 sizeof(My_Connections[new_sock].host ));
1864 /* Register new socket */
1865 if (!io_event_create( new_sock, IO_WANTWRITE, cb_connserver)) {
1866 Log( LOG_ALERT, "io_event_create(): could not add fd %d", strerror(errno));
1867 Conn_Close( new_sock, "io_event_create() failed", NULL, false );
1868 Init_Conn_Struct( new_sock );
1869 Conf_Server[Server].conn_id = NONE;
1872 if (Conf_Server[Server].SSLConnect && !ConnSSL_PrepareConnect( &My_Connections[new_sock],
1873 &Conf_Server[Server] ))
1875 Log(LOG_ALERT, "Could not initialize SSL for outgoing connection");
1876 Conn_Close( new_sock, "Could not initialize SSL for outgoing connection", NULL, false );
1877 Init_Conn_Struct( new_sock );
1878 Conf_Server[Server].conn_id = NONE;
1882 LogDebug("Registered new connection %d on socket %d (%ld in total).",
1883 new_sock, My_Connections[new_sock].sock, NumConnections);
1884 Conn_OPTION_ADD( &My_Connections[new_sock], CONN_ISCONNECTING );
1889 * Initialize connection structure.
1892 Init_Conn_Struct(CONN_ID Idx)
1894 time_t now = time(NULL);
1896 memset(&My_Connections[Idx], 0, sizeof(CONNECTION));
1897 My_Connections[Idx].sock = -1;
1898 My_Connections[Idx].signon = now;
1899 My_Connections[Idx].lastdata = now;
1900 My_Connections[Idx].lastprivmsg = now;
1901 Proc_InitStruct(&My_Connections[Idx].proc_stat);
1902 } /* Init_Conn_Struct */
1906 Init_Socket( int Sock )
1908 /* Initialize socket (set options) */
1912 if (!io_setnonblock(Sock)) {
1913 Log( LOG_CRIT, "Can't enable non-blocking mode for socket: %s!", strerror( errno ));
1918 /* Don't block this port after socket shutdown */
1920 if( setsockopt( Sock, SOL_SOCKET, SO_REUSEADDR, &value, (socklen_t)sizeof( value )) != 0 )
1922 Log( LOG_ERR, "Can't set socket option SO_REUSEADDR: %s!", strerror( errno ));
1923 /* ignore this error */
1926 /* Set type of service (TOS) */
1927 #if defined(IPPROTO_IP) && defined(IPTOS_LOWDELAY)
1928 value = IPTOS_LOWDELAY;
1929 LogDebug("Setting IP_TOS on socket %d to IPTOS_LOWDELAY.", Sock);
1930 if (setsockopt(Sock, IPPROTO_IP, IP_TOS, &value,
1931 (socklen_t) sizeof(value))) {
1932 Log(LOG_ERR, "Can't set socket option IP_TOS: %s!",
1934 /* ignore this error */
1943 cb_Connect_to_Server(int fd, UNUSED short events)
1945 /* Read result of resolver sub-process from pipe and start connection */
1948 ng_ipaddr_t dest_addrs[4]; /* we can handle at most 3; but we read up to
1949 four so we can log the 'more than we can handle'
1950 condition. First result is tried immediately, rest
1951 is saved for later if needed. */
1953 LogDebug("Resolver: Got forward lookup callback on fd %d, events %d", fd, events);
1955 for (i=0; i < MAX_SERVERS; i++) {
1956 if (Proc_GetPipeFd(&Conf_Server[i].res_stat) == fd )
1960 if( i >= MAX_SERVERS) {
1961 /* Ops, no matching server found?! */
1963 LogDebug("Resolver: Got Forward Lookup callback for unknown server!?");
1967 /* Read result from pipe */
1968 len = Proc_Read(&Conf_Server[i].res_stat, dest_addrs, sizeof(dest_addrs));
1972 assert((len % sizeof(ng_ipaddr_t)) == 0);
1974 LogDebug("Got result from resolver: %u structs (%u bytes).", len/sizeof(ng_ipaddr_t), len);
1976 memset(&Conf_Server[i].dst_addr, 0, sizeof(Conf_Server[i].dst_addr));
1977 if (len > sizeof(ng_ipaddr_t)) {
1978 /* more than one address for this hostname, remember them
1979 * in case first address is unreachable/not available */
1980 len -= sizeof(ng_ipaddr_t);
1981 if (len > sizeof(Conf_Server[i].dst_addr)) {
1982 len = sizeof(Conf_Server[i].dst_addr);
1984 "Notice: Resolver returned more IP Addresses for host than we can handle, additional addresses dropped.");
1986 memcpy(&Conf_Server[i].dst_addr, &dest_addrs[1], len);
1989 New_Server(i, dest_addrs);
1990 } /* cb_Read_Forward_Lookup */
1994 cb_Read_Resolver_Result( int r_fd, UNUSED short events )
1996 /* Read result of resolver sub-process from pipe and update the
1997 * apropriate connection/client structure(s): hostname and/or
1998 * IDENT user name.*/
2005 char readbuf[HOST_LEN + 2 + CLIENT_USER_LEN];
2007 char readbuf[HOST_LEN + 1];
2010 LogDebug("Resolver: Got callback on fd %d, events %d", r_fd, events );
2011 i = Conn_GetFromProc(r_fd);
2013 /* Ops, none found? Probably the connection has already
2014 * been closed!? We'll ignore that ... */
2016 LogDebug("Resolver: Got callback for unknown connection!?");
2020 /* Read result from pipe */
2021 len = Proc_Read(&My_Connections[i].proc_stat, readbuf, sizeof readbuf -1);
2025 readbuf[len] = '\0';
2026 identptr = strchr(readbuf, '\n');
2027 assert(identptr != NULL);
2029 Log( LOG_CRIT, "Resolver: Got malformed result!");
2034 LogDebug("Got result from resolver: \"%s\" (%u bytes read).", readbuf, len);
2035 /* Okay, we got a complete result: this is a host name for outgoing
2036 * connections and a host name and IDENT user name (if enabled) for
2037 * incoming connections.*/
2038 assert ( My_Connections[i].sock >= 0 );
2039 /* Incoming connection. Search client ... */
2040 c = Conn_GetClient( i );
2041 assert( c != NULL );
2043 /* Only update client information of unregistered clients.
2044 * Note: user commands (e. g. WEBIRC) are always read _after_ reading
2045 * the resolver results, so we don't have to worry to override settings
2046 * from these commands here. */
2047 if(Client_Type(c) == CLIENT_UNKNOWN) {
2048 strlcpy(My_Connections[i].host, readbuf,
2049 sizeof(My_Connections[i].host));
2050 Client_SetHostname(c, readbuf);
2054 Log(LOG_INFO, "IDENT lookup for connection %d: \"%s\".", i, identptr);
2055 Client_SetUser(c, identptr, true);
2057 Log(LOG_INFO, "IDENT lookup for connection %d: no result.", i);
2062 else Log( LOG_DEBUG, "Resolver: discarding result for already registered connection %d.", i );
2064 } /* cb_Read_Resolver_Result */
2068 * Write a "simple" (error) message to a socket.
2069 * The message is sent without using the connection write buffers, without
2070 * compression/encryption, and even without any error reporting. It is
2071 * designed for error messages of e.g. New_Connection(). */
2073 Simple_Message(int Sock, const char *Msg)
2075 char buf[COMMAND_LEN];
2078 assert(Sock > NONE);
2079 assert(Msg != NULL);
2081 strlcpy(buf, Msg, sizeof buf - 2);
2082 len = strlcat(buf, "\r\n", sizeof buf);
2083 if (write(Sock, buf, len) < 0) {
2084 /* Because this function most probably got called to log
2085 * an error message, any write error is ignored here to
2086 * avoid an endless loop. But casting the result of write()
2087 * to "void" doesn't satisfy the GNU C code attribute
2088 * "warn_unused_result" which is used by some versions of
2089 * glibc (e.g. 2.11.1), therefore this silly error
2090 * "handling" code here :-( */
2093 } /* Simple_Error */
2097 * Get CLIENT structure that belongs to a local connection identified by its
2098 * index number. Each connection belongs to a client by definition, so it is
2099 * not required that the caller checks for NULL return values.
2100 * @param Idx Connection index number
2101 * @return Pointer to CLIENT structure
2104 Conn_GetClient( CONN_ID Idx )
2109 c = array_get(&My_ConnArray, sizeof (CONNECTION), (size_t)Idx);
2111 return c ? c->client : NULL;
2115 * Get PROC_STAT sub-process structure of a connection.
2116 * @param Idx Connection index number
2117 * @return PROC_STAT structure
2120 Conn_GetProcStat(CONN_ID Idx)
2125 c = array_get(&My_ConnArray, sizeof (CONNECTION), (size_t)Idx);
2127 return &c->proc_stat;
2128 } /* Conn_GetProcStat */
2132 * Get CONN_ID from file descriptor associated to a subprocess structure.
2133 * @param fd File descriptor
2134 * @return CONN_ID or NONE (-1)
2137 Conn_GetFromProc(int fd)
2142 for (i = 0; i < Pool_Size; i++) {
2143 if ((My_Connections[i].sock != NONE)
2144 && (Proc_GetPipeFd(&My_Connections[i].proc_stat) == fd))
2148 } /* Conn_GetFromProc */
2154 * Get information about used SSL chiper.
2155 * @param Idx Connection index number
2156 * @param buf Buffer for returned information text
2157 * @param len Size of return buffer "buf"
2158 * @return true on success, false otherwise
2161 Conn_GetCipherInfo(CONN_ID Idx, char *buf, size_t len)
2165 assert(Idx < (int) array_length(&My_ConnArray, sizeof(CONNECTION)));
2166 return ConnSSL_GetCipherInfo(&My_Connections[Idx], buf, len);
2171 * Check if a connection is SSL-enabled or not.
2172 * @param Idx Connection index number
2173 * @return true if connection is SSL-enabled, false otherwise.
2176 Conn_UsesSSL(CONN_ID Idx)
2180 assert(Idx < (int) array_length(&My_ConnArray, sizeof(CONNECTION)));
2181 return Conn_OPTION_ISSET(&My_Connections[Idx], CONN_SSL);
2190 Conn_DebugDump(void)
2194 Log(LOG_DEBUG, "Connection status:");
2195 for (i = 0; i < Pool_Size; i++) {
2196 if (My_Connections[i].sock == NONE)
2199 " - %d: host=%s, lastdata=%ld, lastping=%ld, delaytime=%ld, flag=%d, options=%d, bps=%d, client=%s",
2200 My_Connections[i].sock, My_Connections[i].host,
2201 My_Connections[i].lastdata, My_Connections[i].lastping,
2202 My_Connections[i].delaytime, My_Connections[i].flag,
2203 My_Connections[i].options, My_Connections[i].bps,
2204 My_Connections[i].client ? Client_ID(My_Connections[i].client) : "-");
2206 } /* Conn_DumpClients */