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 if (!io_library_init(CONNECTION_POOL)) {
481 Log(LOG_EMERG, "Cannot initialize IO routines: %s", strerror(errno));
485 assert(Conf_ListenAddress);
487 /* can't use Conf_ListenAddress directly, see below */
488 copy = strdup(Conf_ListenAddress);
490 Log(LOG_CRIT, "Cannot copy %s: %s", Conf_ListenAddress, strerror(errno));
493 listen_addr = strtok(copy, ",");
495 while (listen_addr) {
496 ngt_TrimStr(listen_addr);
498 created += ports_initlisteners(&Conf_ListenPorts, listen_addr, cb_listen);
500 created += ports_initlisteners(&Conf_SSLOptions.ListenPorts, listen_addr, cb_listen_ssl);
504 listen_addr = strtok(NULL, ",");
507 /* Can't free() Conf_ListenAddress here: on REHASH, if the config file
508 * cannot be re-loaded, we'd end up with a NULL Conf_ListenAddress.
509 * Instead, free() takes place in conf.c, before the config file
510 * is being parsed. */
514 } /* Conn_InitListeners */
518 Conn_ExitListeners( void )
520 /* Close down all listening sockets */
524 Rendezvous_UnregisterListeners( );
527 arraylen = array_length(&My_Listeners, sizeof (int));
529 "Shutting down all listening sockets (%d total) ...", arraylen);
530 fd = array_start(&My_Listeners);
535 LogDebug("Listening socket %d closed.", *fd );
538 array_free(&My_Listeners);
539 } /* Conn_ExitListeners */
543 InitSinaddrListenAddr(ng_ipaddr_t *addr, const char *listen_addrstr, UINT16 Port)
547 ret = ng_ipaddr_init(addr, listen_addrstr, Port);
549 assert(listen_addrstr);
550 Log(LOG_CRIT, "Can't bind to [%s]:%u: can't convert ip address \"%s\"",
551 listen_addrstr, Port, listen_addrstr);
558 set_v6_only(int af, int sock)
560 #if defined(IPV6_V6ONLY) && defined(WANT_IPV6)
566 if (setsockopt(sock, IPPROTO_IPV6, IPV6_V6ONLY, &on, (socklen_t)sizeof(on)))
567 Log(LOG_ERR, "Could not set IPV6_V6ONLY: %s", strerror(errno));
575 /* return new listening port file descriptor or -1 on failure */
577 NewListener(const char *listen_addr, UINT16 Port)
579 /* Create new listening socket on specified port */
583 char name[CLIENT_ID_LEN], *info;
585 if (!InitSinaddrListenAddr(&addr, listen_addr, Port))
588 af = ng_ipaddr_af(&addr);
589 sock = socket(af, SOCK_STREAM, 0);
591 Log(LOG_CRIT, "Can't create socket (af %d) : %s!", af, strerror(errno));
595 set_v6_only(af, sock);
597 if (!Init_Socket(sock))
600 if (bind(sock, (struct sockaddr *)&addr, ng_ipaddr_salen(&addr)) != 0) {
601 Log(LOG_CRIT, "Can't bind socket to address %s:%d - %s",
602 ng_ipaddr_tostr(&addr), Port, strerror(errno));
607 if( listen( sock, 10 ) != 0 ) {
608 Log( LOG_CRIT, "Can't listen on socket: %s!", strerror( errno ));
613 /* keep fd in list so we can close it when ngircd restarts/shuts down */
614 if (!array_catb( &My_Listeners,(char*) &sock, sizeof(int) )) {
615 Log( LOG_CRIT, "Can't add socket to My_Listeners array: %s!", strerror( errno ));
620 Log(LOG_INFO, "Now listening on [%s]:%d (socket %d).", ng_ipaddr_tostr(&addr), Port, sock);
623 /* Get best server description text */
624 if( ! Conf_ServerInfo[0] ) info = Conf_ServerName;
627 /* Use server info string */
629 if( Conf_ServerInfo[0] == '[' )
631 /* Cut off leading hostname part in "[]" */
632 info = strchr( Conf_ServerInfo, ']' );
636 while( *info == ' ' ) info++;
639 if( ! info ) info = Conf_ServerInfo;
642 /* Add port number to description if non-standard */
644 snprintf(name, sizeof name, "%s (port %u)", info,
647 strlcpy(name, info, sizeof name);
649 /* Register service */
650 Rendezvous_Register( name, MDNS_TYPE, Port );
658 * SSL/TLS connections require extra treatment:
659 * When either CONN_SSL_WANT_WRITE or CONN_SSL_WANT_READ is set, we
660 * need to take care of that first, before checking read/write buffers.
661 * For instance, while we might have data in our write buffer, the
662 * TLS/SSL protocol might need to read internal data first for TLS/SSL
665 * If this function returns true, such a condition is met and we have
666 * to reverse the condition (check for read even if we've data to write,
667 * do not check for read but writeability even if write-buffer is empty).
670 SSL_WantRead(const CONNECTION *c)
672 if (Conn_OPTION_ISSET(c, CONN_SSL_WANT_READ)) {
673 io_event_add(c->sock, IO_WANTREAD);
679 SSL_WantWrite(const CONNECTION *c)
681 if (Conn_OPTION_ISSET(c, CONN_SSL_WANT_WRITE)) {
682 io_event_add(c->sock, IO_WANTWRITE);
689 SSL_WantRead(UNUSED const CONNECTION *c) { return false; }
691 SSL_WantWrite(UNUSED const CONNECTION *c) { return false; }
696 * "Main Loop": Loop until shutdown or restart is signalled.
697 * This function loops until a shutdown or restart of ngIRCd is signalled and
698 * calls io_dispatch() to check for readable and writable sockets every second.
699 * It checks for status changes on pending connections (e. g. when a hostname
700 * has been resolved), checks for "penalties" and timeouts, and handles the
707 unsigned int wdatalen, bytes_processed;
711 while (!NGIRCd_SignalQuit && !NGIRCd_SignalRestart) {
715 Rendezvous_Handler();
718 /* Should the configuration be reloaded? */
719 if (NGIRCd_SignalRehash)
722 /* Check configured servers and established links */
726 /* Look for non-empty read buffers ... */
727 for (i = 0; i < Pool_Size; i++) {
728 if ((My_Connections[i].sock > NONE)
729 && (array_bytes(&My_Connections[i].rbuf) > 0)
730 && (My_Connections[i].delaytime <= t)) {
731 /* ... and try to handle the received data */
732 bytes_processed = Handle_Buffer(i);
733 /* if we processed data, and there might be
734 * more commands in the input buffer, do not
735 * try to read any more data now */
736 if (bytes_processed &&
737 array_bytes(&My_Connections[i].rbuf) > 2) {
739 ("Throttling connection %d: command limit reached!",
741 Conn_SetPenalty(i, 1);
746 /* Look for non-empty write buffers ... */
747 for (i = 0; i < Pool_Size; i++) {
748 if (My_Connections[i].sock <= NONE)
751 wdatalen = (unsigned int)array_bytes(&My_Connections[i].wbuf);
754 array_bytes(&My_Connections[i].zip.wbuf) > 0)
759 if (SSL_WantRead(&My_Connections[i]))
761 io_event_add(My_Connections[i].sock,
766 /* Check from which sockets we possibly could read ... */
767 for (i = 0; i < Pool_Size; i++) {
768 if (My_Connections[i].sock <= NONE)
771 if (SSL_WantWrite(&My_Connections[i]))
772 continue; /* TLS/SSL layer needs to write data; deal with this first */
774 if (Proc_InProgress(&My_Connections[i].proc_stat)) {
775 /* Wait for completion of forked subprocess
776 * and ignore the socket in the meantime ... */
777 io_event_del(My_Connections[i].sock,
782 if (Conn_OPTION_ISSET(&My_Connections[i], CONN_ISCONNECTING))
783 /* Wait for completion of connect() ... */
786 if (My_Connections[i].delaytime > t) {
787 /* There is a "penalty time" set: ignore socket! */
788 io_event_del(My_Connections[i].sock,
793 io_event_add(My_Connections[i].sock, IO_WANTREAD);
796 /* Set the timeout for reading from the network to 1 second,
797 * which is the granularity with witch we handle "penalty
798 * times" for example.
799 * Note: tv_sec/usec are undefined(!) after io_dispatch()
800 * returns, so we have to set it beforce each call to it! */
804 /* Wait for activity ... */
805 i = io_dispatch(&tv);
806 if (i == -1 && errno != EINTR) {
807 Log(LOG_EMERG, "Conn_Handler(): io_dispatch(): %s!",
809 Log(LOG_ALERT, "%s exiting due to fatal errors!",
815 if (NGIRCd_SignalQuit)
816 Log(LOG_NOTICE | LOG_snotice, "Server going down NOW!");
817 else if (NGIRCd_SignalRestart)
818 Log(LOG_NOTICE | LOG_snotice, "Server restarting NOW!");
823 * Write a text string into the socket of a connection.
824 * This function automatically appends CR+LF to the string and validates that
825 * the result is a valid IRC message (oversized messages are shortened, for
826 * example). Then it calls the Conn_Write() function to do the actual sending.
827 * @param Idx Index fo the connection.
828 * @param Format Format string, see printf().
829 * @return true on success, false otherwise.
833 Conn_WriteStr(CONN_ID Idx, const char *Format, ...)
836 Conn_WriteStr(Idx, Format, va_alist)
842 char buffer[COMMAND_LEN];
847 assert( Idx > NONE );
848 assert( Format != NULL );
851 va_start( ap, Format );
855 if (vsnprintf( buffer, COMMAND_LEN - 2, Format, ap ) >= COMMAND_LEN - 2 ) {
857 * The string that should be written to the socket is longer
858 * than the allowed size of COMMAND_LEN bytes (including both
859 * the CR and LF characters). This can be caused by the
860 * IRC_WriteXXX() functions when the prefix of this server had
861 * to be added to an already "quite long" command line which
862 * has been received from a regular IRC client, for example.
864 * We are not allowed to send such "oversized" messages to
865 * other servers and clients, see RFC 2812 2.3 and 2813 3.3
866 * ("these messages SHALL NOT exceed 512 characters in length,
867 * counting all characters including the trailing CR-LF").
869 * So we have a big problem here: we should send more bytes
870 * to the network than we are allowed to and we don't know
871 * the originator (any more). The "old" behaviour of blaming
872 * the receiver ("next hop") is a bad idea (it could be just
873 * an other server only routing the message!), so the only
874 * option left is to shorten the string and to hope that the
875 * result is still somewhat useful ...
879 strcpy (buffer + sizeof(buffer) - strlen(CUT_TXTSUFFIX) - 2 - 1,
885 Log(LOG_DEBUG, " -> connection %d: '%s'.", Idx, buffer);
888 len = strlcat( buffer, "\r\n", sizeof( buffer ));
889 ok = Conn_Write(Idx, buffer, len);
890 My_Connections[Idx].msg_out++;
894 } /* Conn_WriteStr */
898 * Append Data to the outbound write buffer of a connection.
899 * @param Idx Index of the connection.
900 * @param Data pointer to the data.
901 * @param Len length of Data.
902 * @return true on success, false otherwise.
905 Conn_Write( CONN_ID Idx, char *Data, size_t Len )
908 size_t writebuf_limit = WRITEBUFFER_LEN;
909 assert( Idx > NONE );
910 assert( Data != NULL );
913 c = Conn_GetClient(Idx);
916 /* Servers do get special write buffer limits, so they can generate
917 * all the messages that are required while peering. */
918 if (Client_Type(c) == CLIENT_SERVER)
919 writebuf_limit = WRITEBUFFER_SLINK_LEN;
921 /* Is the socket still open? A previous call to Conn_Write()
922 * may have closed the connection due to a fatal error.
923 * In this case it is sufficient to return an error, as well. */
924 if( My_Connections[Idx].sock <= NONE ) {
925 LogDebug("Skipped write on closed socket (connection %d).", Idx);
930 if ( Conn_OPTION_ISSET( &My_Connections[Idx], CONN_ZIP )) {
932 * Zip_Buffer() does all the dirty work for us: it flushes
933 * the (pre-)compression buffers if required and handles
934 * all error conditions. */
935 if (!Zip_Buffer(Idx, Data, Len))
941 /* Uncompressed link:
942 * Check if outbound buffer has enough space for the data. */
943 if (array_bytes(&My_Connections[Idx].wbuf) + Len >=
945 /* Buffer is full, flush it. Handle_Write deals with
946 * low-level errors, if any. */
947 if (!Handle_Write(Idx))
951 /* When the write buffer is still too big after flushing it,
952 * the connection will be killed. */
953 if (array_bytes(&My_Connections[Idx].wbuf) + Len >=
956 "Write buffer overflow (connection %d, size %lu byte)!",
958 (unsigned long)array_bytes(&My_Connections[Idx].wbuf));
959 Conn_Close(Idx, "Write buffer overflow!", NULL, false);
963 /* Copy data to write buffer */
964 if (!array_catb(&My_Connections[Idx].wbuf, Data, Len))
967 My_Connections[Idx].bytes_out += Len;
970 /* Adjust global write counter */
978 Conn_Close( CONN_ID Idx, const char *LogMsg, const char *FwdMsg, bool InformClient )
980 /* Close connection. Open pipes of asyncronous resolver
981 * sub-processes are closed down. */
987 double in_z_k, out_z_k;
991 assert( Idx > NONE );
993 /* Is this link already shutting down? */
994 if( Conn_OPTION_ISSET( &My_Connections[Idx], CONN_ISCLOSING )) {
995 /* Conn_Close() has been called recursively for this link;
996 * probabe reason: Handle_Write() failed -- see below. */
997 LogDebug("Recursive request to close connection: %d", Idx );
1001 assert( My_Connections[Idx].sock > NONE );
1003 /* Mark link as "closing" */
1004 Conn_OPTION_ADD( &My_Connections[Idx], CONN_ISCLOSING );
1006 port = ng_ipaddr_getport(&My_Connections[Idx].addr);
1007 Log(LOG_INFO, "Shutting down connection %d (%s) with %s:%d ...", Idx,
1008 LogMsg ? LogMsg : FwdMsg, My_Connections[Idx].host, port);
1010 /* Search client, if any */
1011 c = Conn_GetClient( Idx );
1013 /* Should the client be informed? */
1016 /* Send statistics to client if registered as user: */
1017 if ((c != NULL) && (Client_Type(c) == CLIENT_USER)) {
1019 ":%s NOTICE %s :%sConnection statistics: client %.1f kb, server %.1f kb.",
1020 Client_ID(Client_ThisServer()), Client_ID(c),
1022 (double)My_Connections[Idx].bytes_in / 1024,
1023 (double)My_Connections[Idx].bytes_out / 1024);
1026 /* Send ERROR to client (see RFC 2812, section 3.1.7) */
1028 Conn_WriteStr(Idx, "ERROR :%s", FwdMsg);
1030 Conn_WriteStr(Idx, "ERROR :Closing connection.");
1033 /* Try to write out the write buffer. Note: Handle_Write() eventually
1034 * removes the CLIENT structure associated with this connection if an
1035 * error occurs! So we have to re-check if there is still an valid
1036 * CLIENT structure after calling Handle_Write() ...*/
1037 (void)Handle_Write( Idx );
1039 /* Search client, if any (re-check!) */
1040 c = Conn_GetClient( Idx );
1042 if ( Conn_OPTION_ISSET( &My_Connections[Idx], CONN_SSL )) {
1043 Log(LOG_INFO, "SSL connection %d shutting down ...", Idx);
1044 ConnSSL_Free(&My_Connections[Idx]);
1047 /* Shut down socket */
1048 if (! io_close(My_Connections[Idx].sock)) {
1049 /* Oops, we can't close the socket!? This is ... ugly! */
1051 "Error closing connection %d (socket %d) with %s:%d - %s! (ignored)",
1052 Idx, My_Connections[Idx].sock, My_Connections[Idx].host,
1053 port, strerror(errno));
1056 /* Mark socket as invalid: */
1057 My_Connections[Idx].sock = NONE;
1059 /* If there is still a client, unregister it now */
1061 Client_Destroy(c, LogMsg, FwdMsg, true);
1063 /* Calculate statistics and log information */
1064 in_k = (double)My_Connections[Idx].bytes_in / 1024;
1065 out_k = (double)My_Connections[Idx].bytes_out / 1024;
1067 if (Conn_OPTION_ISSET( &My_Connections[Idx], CONN_ZIP)) {
1068 in_z_k = (double)My_Connections[Idx].zip.bytes_in / 1024;
1069 out_z_k = (double)My_Connections[Idx].zip.bytes_out / 1024;
1070 /* Make sure that no division by zero can occur during
1071 * the calculation of in_p and out_p: in_z_k and out_z_k
1072 * are non-zero, that's guaranteed by the protocol until
1073 * compression can be enabled. */
1078 in_p = (int)(( in_k * 100 ) / in_z_k );
1079 out_p = (int)(( out_k * 100 ) / out_z_k );
1081 "Connection %d with %s:%d closed (in: %.1fk/%.1fk/%d%%, out: %.1fk/%.1fk/%d%%).",
1082 Idx, My_Connections[Idx].host, port,
1083 in_k, in_z_k, in_p, out_k, out_z_k, out_p);
1089 "Connection %d with %s:%d closed (in: %.1fk, out: %.1fk).",
1090 Idx, My_Connections[Idx].host, port,
1094 /* Servers: Modify time of next connect attempt? */
1095 Conf_UnsetServer( Idx );
1098 /* Clean up zlib, if link was compressed */
1099 if ( Conn_OPTION_ISSET( &My_Connections[Idx], CONN_ZIP )) {
1100 inflateEnd( &My_Connections[Idx].zip.in );
1101 deflateEnd( &My_Connections[Idx].zip.out );
1102 array_free(&My_Connections[Idx].zip.rbuf);
1103 array_free(&My_Connections[Idx].zip.wbuf);
1107 array_free(&My_Connections[Idx].rbuf);
1108 array_free(&My_Connections[Idx].wbuf);
1110 /* Clean up connection structure (=free it) */
1111 Init_Conn_Struct( Idx );
1113 assert(NumConnections > 0);
1116 LogDebug("Shutdown of connection %d completed, %ld connection%s left.",
1117 Idx, NumConnections, NumConnections != 1 ? "s" : "");
1124 return NumConnections;
1131 return NumConnectionsMax;
1132 } /* Conn_CountMax */
1136 Conn_CountAccepted(void)
1138 return NumConnectionsAccepted;
1139 } /* Conn_CountAccepted */
1143 Conn_SyncServerStruct( void )
1145 /* Synchronize server structures (connection IDs):
1146 * connections <-> configuration */
1152 for( i = 0; i < Pool_Size; i++ ) {
1153 /* Established connection? */
1154 if (My_Connections[i].sock < 0)
1157 /* Server connection? */
1158 client = Conn_GetClient( i );
1159 if(( ! client ) || ( Client_Type( client ) != CLIENT_SERVER )) continue;
1161 for( c = 0; c < MAX_SERVERS; c++ )
1163 /* Configured server? */
1164 if( ! Conf_Server[c].host[0] ) continue;
1167 if( strcmp( Conf_Server[c].name, Client_ID( client )) == 0 )
1168 Conf_Server[c].conn_id = i;
1171 } /* SyncServerStruct */
1175 * Send out data of write buffer; connect new sockets.
1178 Handle_Write( CONN_ID Idx )
1183 assert( Idx > NONE );
1184 if ( My_Connections[Idx].sock < 0 ) {
1185 LogDebug("Handle_Write() on closed socket, connection %d", Idx);
1188 assert( My_Connections[Idx].sock > NONE );
1190 wdatalen = array_bytes(&My_Connections[Idx].wbuf );
1193 if (wdatalen == 0) {
1194 /* Write buffer is empty, so we try to flush the compression
1195 * buffer and get some data to work with from there :-) */
1196 if (!Zip_Flush(Idx))
1199 /* Now the write buffer most probably has changed: */
1200 wdatalen = array_bytes(&My_Connections[Idx].wbuf);
1204 if (wdatalen == 0) {
1205 /* Still no data, fine. */
1206 io_event_del(My_Connections[Idx].sock, IO_WANTWRITE );
1211 ("Handle_Write() called for connection %d, %ld bytes pending ...",
1215 if ( Conn_OPTION_ISSET( &My_Connections[Idx], CONN_SSL )) {
1216 len = ConnSSL_Write(&My_Connections[Idx], array_start(&My_Connections[Idx].wbuf), wdatalen);
1220 len = write(My_Connections[Idx].sock,
1221 array_start(&My_Connections[Idx].wbuf), wdatalen );
1224 if (errno == EAGAIN || errno == EINTR)
1227 Log(LOG_ERR, "Write error on connection %d (socket %d): %s!",
1228 Idx, My_Connections[Idx].sock, strerror(errno));
1229 Conn_Close(Idx, "Write error!", NULL, false);
1233 /* move any data not yet written to beginning */
1234 array_moveleft(&My_Connections[Idx].wbuf, 1, (size_t)len);
1237 } /* Handle_Write */
1241 Count_Connections(ng_ipaddr_t *a)
1246 for (i = 0; i < Pool_Size; i++) {
1247 if (My_Connections[i].sock <= NONE)
1249 if (ng_ipaddr_ipequal(&My_Connections[i].addr, a))
1253 } /* Count_Connections */
1257 * Initialize new client connection on a listening socket.
1258 * @param Sock Listening socket descriptor
1259 * @return Accepted socket descriptor or -1 on error
1262 New_Connection(int Sock)
1265 struct request_info req;
1267 ng_ipaddr_t new_addr;
1268 char ip_str[NG_INET_ADDRSTRLEN];
1269 int new_sock, new_sock_len, identsock;
1273 assert(Sock > NONE);
1275 new_sock_len = (int)sizeof(new_addr);
1276 new_sock = accept(Sock, (struct sockaddr *)&new_addr,
1277 (socklen_t *)&new_sock_len);
1279 Log(LOG_CRIT, "Can't accept connection: %s!", strerror(errno));
1282 NumConnectionsAccepted++;
1284 if (!ng_ipaddr_tostr_r(&new_addr, ip_str)) {
1285 Log(LOG_CRIT, "fd %d: Can't convert IP address!", new_sock);
1286 Simple_Message(new_sock, "ERROR :Internal Server Error");
1292 /* Validate socket using TCP Wrappers */
1293 request_init(&req, RQ_DAEMON, PACKAGE_NAME, RQ_FILE, new_sock,
1294 RQ_CLIENT_SIN, &new_addr, NULL);
1296 if (!hosts_access(&req)) {
1298 "Refused connection from %s (by TCP Wrappers)!", ip_str);
1299 Simple_Message(new_sock, "ERROR :Connection refused");
1305 if (!Init_Socket(new_sock))
1308 /* Check global connection limit */
1309 if ((Conf_MaxConnections > 0) &&
1310 (NumConnections >= (size_t) Conf_MaxConnections)) {
1311 Log(LOG_ALERT, "Can't accept connection: limit (%d) reached!",
1312 Conf_MaxConnections);
1313 Simple_Message(new_sock, "ERROR :Connection limit reached");
1318 /* Check IP-based connection limit */
1319 cnt = Count_Connections(&new_addr);
1320 if ((Conf_MaxConnectionsIP > 0) && (cnt >= Conf_MaxConnectionsIP)) {
1321 /* Access denied, too many connections from this IP address! */
1323 "Refused connection from %s: too may connections (%ld) from this IP address!",
1325 Simple_Message(new_sock,
1326 "ERROR :Connection refused, too many connections from your IP address!");
1331 if (new_sock >= Pool_Size) {
1332 if (!array_alloc(&My_ConnArray, sizeof(CONNECTION),
1333 (size_t) new_sock)) {
1335 "Can't allocate memory! [New_Connection]");
1336 Simple_Message(new_sock, "ERROR: Internal error");
1340 LogDebug("Bumped connection pool to %ld items (internal: %ld items, %ld bytes)",
1341 new_sock, array_length(&My_ConnArray,
1342 sizeof(CONNECTION)), array_bytes(&My_ConnArray));
1344 /* Adjust pointer to new block */
1345 My_Connections = array_start(&My_ConnArray);
1346 while (Pool_Size <= new_sock)
1347 Init_Conn_Struct(Pool_Size++);
1350 /* register callback */
1351 if (!io_event_create(new_sock, IO_WANTREAD, cb_clientserver)) {
1353 "Can't accept connection: io_event_create failed!");
1354 Simple_Message(new_sock, "ERROR :Internal error");
1359 c = Client_NewLocal(new_sock, ip_str, CLIENT_UNKNOWN, false);
1362 "Can't accept connection: can't create client structure!");
1363 Simple_Message(new_sock, "ERROR :Internal error");
1368 Init_Conn_Struct(new_sock);
1369 My_Connections[new_sock].sock = new_sock;
1370 My_Connections[new_sock].addr = new_addr;
1371 My_Connections[new_sock].client = c;
1373 /* Set initial hostname to IP address. This becomes overwritten when
1374 * the DNS lookup is enabled and succeeds, but is used otherwise. */
1375 if (ng_ipaddr_af(&new_addr) != AF_INET)
1376 snprintf(My_Connections[new_sock].host,
1377 sizeof(My_Connections[new_sock].host), "[%s]", ip_str);
1379 strlcpy(My_Connections[new_sock].host, ip_str,
1380 sizeof(My_Connections[new_sock].host));
1382 Client_SetHostname(c, My_Connections[new_sock].host);
1384 Log(LOG_INFO, "Accepted connection %d from %s:%d on socket %d.",
1385 new_sock, My_Connections[new_sock].host,
1386 ng_ipaddr_getport(&new_addr), Sock);
1388 identsock = new_sock;
1394 Resolve_Addr(&My_Connections[new_sock].proc_stat, &new_addr,
1395 identsock, cb_Read_Resolver_Result);
1397 Account_Connection();
1399 } /* New_Connection */
1403 Account_Connection(void)
1406 if (NumConnections > NumConnectionsMax)
1407 NumConnectionsMax = NumConnections;
1408 LogDebug("Total number of connections now %lu (max %lu).",
1409 NumConnections, NumConnectionsMax);
1410 } /* Account_Connection */
1414 Socket2Index( int Sock )
1416 assert( Sock >= 0 );
1418 if( Sock >= Pool_Size || My_Connections[Sock].sock != Sock ) {
1419 /* the Connection was already closed again, likely due to
1421 LogDebug("Socket2Index: can't get connection for socket %d!", Sock);
1425 } /* Socket2Index */
1429 * Read data from the network to the read buffer. If an error occures,
1430 * the socket of this connection will be shut down.
1433 Read_Request( CONN_ID Idx )
1436 static const unsigned int maxbps = COMMAND_LEN / 2;
1437 char readbuf[READBUFFER_LEN];
1440 assert( Idx > NONE );
1441 assert( My_Connections[Idx].sock > NONE );
1444 if ((array_bytes(&My_Connections[Idx].rbuf) >= READBUFFER_LEN) ||
1445 (array_bytes(&My_Connections[Idx].zip.rbuf) >= READBUFFER_LEN))
1447 if (array_bytes(&My_Connections[Idx].rbuf) >= READBUFFER_LEN)
1450 /* Read buffer is full */
1452 "Receive buffer overflow (connection %d): %d bytes!",
1453 Idx, array_bytes(&My_Connections[Idx].rbuf));
1454 Conn_Close( Idx, "Receive buffer overflow!", NULL, false );
1459 if (Conn_OPTION_ISSET(&My_Connections[Idx], CONN_SSL))
1460 len = ConnSSL_Read( &My_Connections[Idx], readbuf, sizeof(readbuf));
1463 len = read(My_Connections[Idx].sock, readbuf, sizeof(readbuf));
1465 Log(LOG_INFO, "%s:%u (%s) is closing the connection ...",
1466 My_Connections[Idx].host,
1467 (unsigned int) ng_ipaddr_getport(&My_Connections[Idx].addr),
1468 ng_ipaddr_tostr(&My_Connections[Idx].addr));
1470 "Socket closed!", "Client closed connection",
1476 if( errno == EAGAIN ) return;
1477 Log(LOG_ERR, "Read error on connection %d (socket %d): %s!",
1478 Idx, My_Connections[Idx].sock, strerror(errno));
1479 Conn_Close(Idx, "Read error!", "Client closed connection",
1484 if (Conn_OPTION_ISSET(&My_Connections[Idx], CONN_ZIP)) {
1485 if (!array_catb(&My_Connections[Idx].zip.rbuf, readbuf,
1488 "Could not append recieved data to zip input buffer (connn %d): %d bytes!",
1490 Conn_Close(Idx, "Receive buffer overflow!", NULL,
1497 if (!array_catb( &My_Connections[Idx].rbuf, readbuf, len)) {
1498 Log( LOG_ERR, "Could not append recieved data to input buffer (connn %d): %d bytes!", Idx, len );
1499 Conn_Close( Idx, "Receive buffer overflow!", NULL, false );
1503 /* Update connection statistics */
1504 My_Connections[Idx].bytes_in += len;
1506 /* Update timestamp of last data received if this connection is
1507 * registered as a user, server or service connection. Don't update
1508 * otherwise, so users have at least Conf_PongTimeout seconds time to
1509 * register with the IRC server -- see Check_Connections().
1510 * Set "lastping", too, so we can handle time shifts backwards ... */
1511 c = Conn_GetClient(Idx);
1512 if (c && (Client_Type(c) == CLIENT_USER
1513 || Client_Type(c) == CLIENT_SERVER
1514 || Client_Type(c) == CLIENT_SERVICE)) {
1516 if (My_Connections[Idx].lastdata != t)
1517 My_Connections[Idx].bps = 0;
1519 My_Connections[Idx].lastdata = t;
1520 My_Connections[Idx].lastping = My_Connections[Idx].lastdata;
1523 /* Look at the data in the (read-) buffer of this connection */
1524 My_Connections[Idx].bps += Handle_Buffer(Idx);
1525 if (Client_Type(c) != CLIENT_SERVER
1526 && My_Connections[Idx].bps >= maxbps) {
1527 LogDebug("Throttling connection %d: BPS exceeded! (%u >= %u)",
1528 Idx, My_Connections[Idx].bps, maxbps);
1529 Conn_SetPenalty(Idx, 1);
1531 } /* Read_Request */
1535 * Handle all data in the connection read-buffer.
1536 * Data is processed until no complete command is left in the read buffer,
1537 * or MAX_COMMANDS[_SERVER] commands were processed.
1538 * When a fatal error occurs, the connection is shut down.
1539 * @param Idx Index of the connection.
1540 * @return number of bytes processed.
1543 Handle_Buffer(CONN_ID Idx)
1546 char *ptr1, *ptr2, *first_eol;
1554 unsigned int i, maxcmd = MAX_COMMANDS, len_processed = 0;
1557 c = Conn_GetClient(Idx);
1560 /* Servers do get special command limits, so they can process
1561 * all the messages that are required while peering. */
1562 if (Client_Type(c) == CLIENT_SERVER)
1563 maxcmd = MAX_COMMANDS_SERVER;
1565 starttime = time(NULL);
1566 for (i=0; i < maxcmd; i++) {
1568 if (My_Connections[Idx].delaytime > starttime)
1571 /* Unpack compressed data, if compression is in use */
1572 if (Conn_OPTION_ISSET(&My_Connections[Idx], CONN_ZIP)) {
1573 /* When unzipping fails, Unzip_Buffer() shuts
1574 * down the connection itself */
1575 if (!Unzip_Buffer(Idx))
1580 if (0 == array_bytes(&My_Connections[Idx].rbuf))
1583 /* Make sure that the buffer is NULL terminated */
1584 if (!array_cat0_temporary(&My_Connections[Idx].rbuf)) {
1585 Conn_Close(Idx, NULL,
1586 "Can't allocate memory [Handle_Buffer]",
1591 /* RFC 2812, section "2.3 Messages", 5th paragraph:
1592 * "IRC messages are always lines of characters terminated
1593 * with a CR-LF (Carriage Return - Line Feed) pair [...]". */
1595 ptr = strstr(array_start(&My_Connections[Idx].rbuf), "\r\n");
1598 /* Check for non-RFC-compliant request (only CR or LF)?
1599 * Unfortunately, there are quite a few clients out there
1600 * that do this -- e. g. mIRC, BitchX, and Trillian :-( */
1601 ptr1 = strchr(array_start(&My_Connections[Idx].rbuf), '\r');
1602 ptr2 = strchr(array_start(&My_Connections[Idx].rbuf), '\n');
1604 /* Check if there is a single CR or LF _before_ the
1605 * corerct CR+LF line terminator: */
1606 first_eol = ptr1 < ptr2 ? ptr1 : ptr2;
1607 if (first_eol < ptr) {
1608 /* Single CR or LF before CR+LF found */
1612 } else if (ptr1 || ptr2) {
1613 /* No CR+LF terminated command found, but single
1614 * CR or LF found ... */
1616 ptr = ptr1 < ptr2 ? ptr1 : ptr2;
1618 ptr = ptr1 ? ptr1 : ptr2;
1626 /* Complete (=line terminated) request found, handle it! */
1629 len = ptr - (char *)array_start(&My_Connections[Idx].rbuf) + delta;
1631 if (len > (COMMAND_LEN - 1)) {
1632 /* Request must not exceed 512 chars (incl. CR+LF!),
1633 * see RFC 2812. Disconnect Client if this happens. */
1635 "Request too long (connection %d): %d bytes (max. %d expected)!",
1636 Idx, array_bytes(&My_Connections[Idx].rbuf),
1638 Conn_Close(Idx, NULL, "Request too long", true);
1642 len_processed += (unsigned int)len;
1644 /* Request is empty (only '\r\n', '\r' or '\n');
1645 * delta is 2 ('\r\n') or 1 ('\r' or '\n'), see above */
1646 array_moveleft(&My_Connections[Idx].rbuf, 1, len);
1650 /* remember if stream is already compressed */
1651 old_z = My_Connections[Idx].options & CONN_ZIP;
1654 My_Connections[Idx].msg_in++;
1656 (Idx, (char *)array_start(&My_Connections[Idx].rbuf)))
1657 return 0; /* error -> connection has been closed */
1659 array_moveleft(&My_Connections[Idx].rbuf, 1, len);
1660 LogDebug("Connection %d: %d bytes left in read buffer.",
1661 Idx, array_bytes(&My_Connections[Idx].rbuf));
1663 if ((!old_z) && (My_Connections[Idx].options & CONN_ZIP) &&
1664 (array_bytes(&My_Connections[Idx].rbuf) > 0)) {
1665 /* The last command activated socket compression.
1666 * Data that was read after that needs to be copied
1667 * to the unzip buffer for decompression: */
1669 (&My_Connections[Idx].zip.rbuf,
1670 &My_Connections[Idx].rbuf)) {
1671 Conn_Close(Idx, NULL,
1672 "Can't allocate memory [Handle_Buffer]",
1677 array_trunc(&My_Connections[Idx].rbuf);
1679 ("Moved already received data (%u bytes) to uncompression buffer.",
1680 array_bytes(&My_Connections[Idx].zip.rbuf));
1684 return len_processed;
1685 } /* Handle_Buffer */
1689 Check_Connections(void)
1691 /* check if connections are alive. if not, play PING-PONG first.
1692 * if this doesn't help either, disconnect client. */
1697 for (i = 0; i < Pool_Size; i++) {
1698 if (My_Connections[i].sock < 0)
1701 c = Conn_GetClient(i);
1702 if (c && ((Client_Type(c) == CLIENT_USER)
1703 || (Client_Type(c) == CLIENT_SERVER)
1704 || (Client_Type(c) == CLIENT_SERVICE))) {
1705 /* connected User, Server or Service */
1706 if (My_Connections[i].lastping >
1707 My_Connections[i].lastdata) {
1708 /* We already sent a ping */
1709 if (My_Connections[i].lastping <
1710 time(NULL) - Conf_PongTimeout) {
1713 ("Connection %d: Ping timeout: %d seconds.",
1714 i, Conf_PongTimeout);
1715 snprintf(msg, sizeof(msg), "Ping timeout: %d seconds", Conf_PongTimeout);
1716 Conn_Close(i, NULL, msg, true);
1718 } else if (My_Connections[i].lastdata <
1719 time(NULL) - Conf_PingTimeout) {
1720 /* We need to send a PING ... */
1721 LogDebug("Connection %d: sending PING ...", i);
1722 My_Connections[i].lastping = time(NULL);
1723 Conn_WriteStr(i, "PING :%s",
1724 Client_ID(Client_ThisServer()));
1727 /* The connection is not fully established yet, so
1728 * we don't do the PING-PONG game here but instead
1729 * disconnect the client after "a short time" if it's
1730 * still not registered. */
1732 if (My_Connections[i].lastdata <
1733 time(NULL) - Conf_PongTimeout) {
1735 ("Unregistered connection %d timed out ...",
1737 Conn_Close(i, NULL, "Timeout", false);
1741 } /* Check_Connections */
1745 Check_Servers( void )
1747 /* Check if we can establish further server links */
1752 /* Check all configured servers */
1753 for( i = 0; i < MAX_SERVERS; i++ ) {
1754 /* Valid outgoing server which isn't already connected or disabled? */
1755 if(( ! Conf_Server[i].host[0] ) || ( ! Conf_Server[i].port > 0 ) ||
1756 ( Conf_Server[i].conn_id > NONE ) || ( Conf_Server[i].flags & CONF_SFLAG_DISABLED ))
1759 /* Is there already a connection in this group? */
1760 if( Conf_Server[i].group > NONE ) {
1761 for (n = 0; n < MAX_SERVERS; n++) {
1762 if (n == i) continue;
1763 if ((Conf_Server[n].conn_id != NONE) &&
1764 (Conf_Server[n].group == Conf_Server[i].group))
1767 if (n < MAX_SERVERS) continue;
1770 /* Check last connect attempt? */
1771 time_now = time(NULL);
1772 if( Conf_Server[i].lasttry > (time_now - Conf_ConnectRetry))
1775 /* Okay, try to connect now */
1776 Conf_Server[i].lasttry = time_now;
1777 Conf_Server[i].conn_id = SERVER_WAIT;
1778 assert(Proc_GetPipeFd(&Conf_Server[i].res_stat) < 0);
1779 Resolve_Name(&Conf_Server[i].res_stat, Conf_Server[i].host, 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);