2 * ngIRCd -- The Next Generation IRC Daemon
3 * Copyright (c)2001-2011 Alexander Barton (alex@barton.de) and Contributors.
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.
22 * Connection management
37 #include <sys/socket.h>
39 #include <sys/types.h>
41 #include <netinet/in.h>
43 #ifdef HAVE_NETINET_IP_H
44 # ifdef HAVE_NETINET_IN_SYSTM_H
45 # include <netinet/in_systm.h>
47 # include <netinet/ip.h>
51 # include <stdint.h> /* e.g. for Mac OS X */
55 # include <tcpd.h> /* for TCP Wrappers */
72 #include "conn-func.h"
74 #include "ng_ipaddr.h"
82 #define SERVER_WAIT (NONE - 1)
84 #define MAX_COMMANDS 3
85 #define MAX_COMMANDS_SERVER 10
86 #define MAX_COMMANDS_SERVICE MAX_COMMANDS_SERVER
89 static bool Handle_Write PARAMS(( CONN_ID Idx ));
90 static bool Conn_Write PARAMS(( CONN_ID Idx, char *Data, size_t Len ));
91 static int New_Connection PARAMS(( int Sock ));
92 static CONN_ID Socket2Index PARAMS(( int Sock ));
93 static void Read_Request PARAMS(( CONN_ID Idx ));
94 static unsigned int Handle_Buffer PARAMS(( CONN_ID Idx ));
95 static void Check_Connections PARAMS(( void ));
96 static void Check_Servers PARAMS(( void ));
97 static void Init_Conn_Struct PARAMS(( CONN_ID Idx ));
98 static bool Init_Socket PARAMS(( int Sock ));
99 static void New_Server PARAMS(( int Server, ng_ipaddr_t *dest ));
100 static void Simple_Message PARAMS(( int Sock, const char *Msg ));
101 static int NewListener PARAMS(( const char *listen_addr, UINT16 Port ));
102 static void Account_Connection PARAMS((void));
105 static array My_Listeners;
106 static array My_ConnArray;
107 static size_t NumConnections, NumConnectionsMax, NumConnectionsAccepted;
110 int allow_severity = LOG_INFO;
111 int deny_severity = LOG_ERR;
114 static void server_login PARAMS((CONN_ID idx));
117 extern struct SSLOptions Conf_SSLOptions;
118 static void cb_connserver_login_ssl PARAMS((int sock, short what));
119 static void cb_clientserver_ssl PARAMS((int sock, short what));
121 static void cb_Read_Resolver_Result PARAMS((int sock, UNUSED short what));
122 static void cb_Connect_to_Server PARAMS((int sock, UNUSED short what));
123 static void cb_clientserver PARAMS((int sock, short what));
127 * IO callback for listening sockets: handle new connections. This callback
128 * gets called when a new non-SSL connection should be accepted.
130 * @param sock Socket descriptor.
131 * @param irrelevant (ignored IO specification)
134 cb_listen(int sock, short irrelevant)
137 (void) New_Connection(sock);
143 * IO callback for listening SSL sockets: handle new connections. This callback
144 * gets called when a new SSL-enabled connection should be accepted.
146 * @param sock Socket descriptor.
147 * @param irrelevant (ignored IO specification)
150 cb_listen_ssl(int sock, short irrelevant)
155 fd = New_Connection(sock);
158 io_event_setcb(My_Connections[fd].sock, cb_clientserver_ssl);
164 * IO callback for new outgoing non-SSL server connections.
166 * @param sock Socket descriptor.
167 * @param what IO specification (IO_WANTREAD/IO_WANTWRITE/...).
170 cb_connserver(int sock, UNUSED short what)
172 int res, err, server;
174 CONN_ID idx = Socket2Index( sock );
177 LogDebug("cb_connserver wants to write on unknown socket?!");
182 assert(what & IO_WANTWRITE);
184 /* Make sure that the server is still configured; it could have been
185 * removed in the meantime! */
186 server = Conf_GetServer(idx);
188 Log(LOG_ERR, "Connection on socket %d to \"%s\" aborted!",
189 sock, My_Connections[idx].host);
190 Conn_Close(idx, "Connection aborted!", NULL, false);
194 /* connect() finished, get result. */
195 sock_len = (socklen_t)sizeof(err);
196 res = getsockopt(My_Connections[idx].sock, SOL_SOCKET, SO_ERROR,
198 assert(sock_len == sizeof(err));
200 /* Error while connecting? */
201 if ((res != 0) || (err != 0)) {
203 Log(LOG_CRIT, "getsockopt (connection %d): %s!",
204 idx, strerror(errno));
207 "Can't connect socket to \"%s:%d\" (connection %d): %s!",
208 My_Connections[idx].host, Conf_Server[server].port,
211 Conn_Close(idx, "Can't connect!", NULL, false);
213 if (ng_ipaddr_af(&Conf_Server[server].dst_addr[0])) {
214 /* more addresses to try... */
215 New_Server(server, &Conf_Server[server].dst_addr[0]);
216 /* connection to dst_addr[0] is now in progress, so
217 * remove this address... */
218 Conf_Server[server].dst_addr[0] =
219 Conf_Server[server].dst_addr[1];
220 memset(&Conf_Server[server].dst_addr[1], 0,
221 sizeof(Conf_Server[server].dst_addr[1]));
226 /* connect() succeeded, remove all additional addresses */
227 memset(&Conf_Server[server].dst_addr, 0,
228 sizeof(Conf_Server[server].dst_addr));
230 Conn_OPTION_DEL( &My_Connections[idx], CONN_ISCONNECTING );
232 if ( Conn_OPTION_ISSET( &My_Connections[idx], CONN_SSL_CONNECT )) {
233 io_event_setcb( sock, cb_connserver_login_ssl );
234 io_event_add( sock, IO_WANTWRITE|IO_WANTREAD );
243 * Login to a remote server.
245 * @param idx Connection index.
248 server_login(CONN_ID idx)
251 "Connection %d (socket %d) with \"%s:%d\" established. Now logging in ...",
252 idx, My_Connections[idx].sock, My_Connections[idx].host,
253 Conf_Server[Conf_GetServer(idx)].port);
255 io_event_setcb( My_Connections[idx].sock, cb_clientserver);
256 io_event_add( My_Connections[idx].sock, IO_WANTREAD|IO_WANTWRITE);
258 /* Send PASS and SERVER command to peer */
259 Conn_WriteStr( idx, "PASS %s %s", Conf_Server[Conf_GetServer( idx )].pwd_out, NGIRCd_ProtoID );
260 Conn_WriteStr( idx, "SERVER %s :%s", Conf_ServerName, Conf_ServerInfo );
266 * IO callback for new outgoing SSL-enabled server connections.
268 * @param sock Socket descriptor.
269 * @param unused (ignored IO specification)
272 cb_connserver_login_ssl(int sock, short unused)
274 CONN_ID idx = Socket2Index(sock);
282 switch (ConnSSL_Connect( &My_Connections[idx])) {
284 case 0: LogDebug("ConnSSL_Connect: not ready");
287 Log(LOG_ERR, "SSL connection on socket %d failed!", sock);
288 Conn_Close(idx, "Can't connect!", NULL, false);
292 Log( LOG_INFO, "SSL connection %d with \"%s:%d\" established.", idx,
293 My_Connections[idx].host, Conf_Server[Conf_GetServer( idx )].port );
301 * IO callback for established non-SSL client and server connections.
303 * @param sock Socket descriptor.
304 * @param what IO specification (IO_WANTREAD/IO_WANTWRITE/...).
307 cb_clientserver(int sock, short what)
309 CONN_ID idx = Socket2Index(sock);
318 if (what & IO_WANTREAD
319 || (Conn_OPTION_ISSET(&My_Connections[idx], CONN_SSL_WANT_WRITE))) {
320 /* if TLS layer needs to write additional data, call
321 * Read_Request() instead so that SSL/TLS can continue */
325 if (what & IO_WANTREAD)
328 if (what & IO_WANTWRITE)
335 * IO callback for established SSL-enabled client and server connections.
337 * @param sock Socket descriptor.
338 * @param what IO specification (IO_WANTREAD/IO_WANTWRITE/...).
341 cb_clientserver_ssl(int sock, short what)
343 CONN_ID idx = Socket2Index(sock);
352 switch (ConnSSL_Accept(&My_Connections[idx])) {
356 return; /* EAGAIN: callback will be invoked again by IO layer */
358 Conn_Close(idx, "SSL accept error, closing socket", "SSL accept error", false);
361 if (what & IO_WANTREAD)
364 if (what & IO_WANTWRITE)
367 io_event_setcb(sock, cb_clientserver); /* SSL handshake completed */
373 * Initialite connecion module.
380 /* Speicher fuer Verbindungs-Pool anfordern */
381 Pool_Size = CONNECTION_POOL;
382 if ((Conf_MaxConnections > 0) &&
383 (Pool_Size > Conf_MaxConnections))
384 Pool_Size = Conf_MaxConnections;
386 if (!array_alloc(&My_ConnArray, sizeof(CONNECTION), (size_t)Pool_Size)) {
387 Log(LOG_EMERG, "Can't allocate memory! [Conn_Init]");
391 /* FIXME: My_Connetions/Pool_Size is needed by other parts of the
392 * code; remove them! */
393 My_Connections = (CONNECTION*) array_start(&My_ConnArray);
395 LogDebug("Allocated connection pool for %d items (%ld bytes).",
396 array_length(&My_ConnArray, sizeof(CONNECTION)),
397 array_bytes(&My_ConnArray));
399 assert(array_length(&My_ConnArray, sizeof(CONNECTION)) >= (size_t)Pool_Size);
401 array_free( &My_Listeners );
403 for (i = 0; i < Pool_Size; i++)
409 * Clean up connection module.
416 Conn_ExitListeners();
418 LogDebug("Shutting down all connections ..." );
419 for( idx = 0; idx < Pool_Size; idx++ ) {
420 if( My_Connections[idx].sock > NONE ) {
421 Conn_Close( idx, NULL, NGIRCd_SignalRestart ?
422 "Server going down (restarting)":"Server going down", true );
426 array_free(&My_ConnArray);
427 My_Connections = NULL;
429 io_library_shutdown();
434 * Close all sockets (file descriptors) of open connections.
435 * This is useful in forked child processes, for example, to make sure that
436 * they don't hold connections open that the main process wants to close.
439 Conn_CloseAllSockets(int ExceptOf)
443 for(idx = 0; idx < Pool_Size; idx++) {
444 if(My_Connections[idx].sock > NONE &&
445 My_Connections[idx].sock != ExceptOf)
446 close(My_Connections[idx].sock);
452 * Initialize listening ports.
454 * @param a Array containing the ports the daemon should listen on.
455 * @param listen_addr Address the socket should listen on (can be "0.0.0.0").
456 * @param func IO callback function to register.
457 * @returns Number of listening sockets created.
460 ports_initlisteners(array *a, const char *listen_addr, void (*func)(int,short))
462 unsigned int created = 0;
467 len = array_length(a, sizeof (UINT16));
468 port = array_start(a);
470 fd = NewListener(listen_addr, *port);
475 if (!io_event_create( fd, IO_WANTREAD, func )) {
476 Log( LOG_ERR, "io_event_create(): Could not add listening fd %d (port %u): %s!",
477 fd, (unsigned int) *port, strerror(errno));
490 * Initialize all listening sockets.
492 * @returns Number of created listening sockets
495 Conn_InitListeners( void )
497 /* Initialize ports on which the server should accept connections */
498 unsigned int created = 0;
499 char *copy, *listen_addr;
501 assert(Conf_ListenAddress);
503 /* can't use Conf_ListenAddress directly, see below */
504 copy = strdup(Conf_ListenAddress);
506 Log(LOG_CRIT, "Cannot copy %s: %s", Conf_ListenAddress, strerror(errno));
509 listen_addr = strtok(copy, ",");
511 while (listen_addr) {
512 ngt_TrimStr(listen_addr);
514 created += ports_initlisteners(&Conf_ListenPorts, listen_addr, cb_listen);
516 created += ports_initlisteners(&Conf_SSLOptions.ListenPorts, listen_addr, cb_listen_ssl);
520 listen_addr = strtok(NULL, ",");
523 /* Can't free() Conf_ListenAddress here: on REHASH, if the config file
524 * cannot be re-loaded, we'd end up with a NULL Conf_ListenAddress.
525 * Instead, free() takes place in conf.c, before the config file
526 * is being parsed. */
530 } /* Conn_InitListeners */
534 * Shut down all listening sockets.
537 Conn_ExitListeners( void )
539 /* Close down all listening sockets */
543 arraylen = array_length(&My_Listeners, sizeof (int));
545 "Shutting down all listening sockets (%d total) ...", arraylen);
546 fd = array_start(&My_Listeners);
551 LogDebug("Listening socket %d closed.", *fd );
554 array_free(&My_Listeners);
555 } /* Conn_ExitListeners */
559 * Bind a socket to a specific (source) address.
561 * @param addr Address structure.
562 * @param listen_addrstr Source address as string.
563 * @param Port Port number.
564 * @returns true on success, false otherwise.
567 InitSinaddrListenAddr(ng_ipaddr_t *addr, const char *listen_addrstr, UINT16 Port)
571 ret = ng_ipaddr_init(addr, listen_addrstr, Port);
573 assert(listen_addrstr);
574 Log(LOG_CRIT, "Can't bind to [%s]:%u: can't convert ip address \"%s\"",
575 listen_addrstr, Port, listen_addrstr);
582 * Set a socket to "IPv6 only". If the given socket doesn't belong to the
583 * AF_INET6 family, or the operating system doesn't support this functionality,
584 * this function retruns silently.
586 * @param af Address family of the socket.
587 * @param sock Socket handle.
590 set_v6_only(int af, int sock)
592 #if defined(IPV6_V6ONLY) && defined(WANT_IPV6)
598 if (setsockopt(sock, IPPROTO_IPV6, IPV6_V6ONLY, &on, (socklen_t)sizeof(on)))
599 Log(LOG_ERR, "Could not set IPV6_V6ONLY: %s", strerror(errno));
608 * Initialize new listening port.
610 * @param listen_addr Local address to bind the socet to (can be 0.0.0.0).
611 * @param Port Port number on which the new socket should be listening.
612 * @returns file descriptor of the socket or -1 on failure.
615 NewListener(const char *listen_addr, UINT16 Port)
617 /* Create new listening socket on specified port */
621 if (!InitSinaddrListenAddr(&addr, listen_addr, Port))
624 af = ng_ipaddr_af(&addr);
625 sock = socket(af, SOCK_STREAM, 0);
627 Log(LOG_CRIT, "Can't create socket (af %d) : %s!", af, strerror(errno));
631 set_v6_only(af, sock);
633 if (!Init_Socket(sock))
636 if (bind(sock, (struct sockaddr *)&addr, ng_ipaddr_salen(&addr)) != 0) {
637 Log(LOG_CRIT, "Can't bind socket to address %s:%d - %s",
638 ng_ipaddr_tostr(&addr), Port, strerror(errno));
643 if( listen( sock, 10 ) != 0 ) {
644 Log( LOG_CRIT, "Can't listen on socket: %s!", strerror( errno ));
649 /* keep fd in list so we can close it when ngircd restarts/shuts down */
650 if (!array_catb( &My_Listeners,(char*) &sock, sizeof(int) )) {
651 Log( LOG_CRIT, "Can't add socket to My_Listeners array: %s!", strerror( errno ));
656 Log(LOG_INFO, "Now listening on [%s]:%d (socket %d).",
657 ng_ipaddr_tostr(&addr), Port, sock);
665 * Check if SSL library needs to read SSL-protocol related data.
667 * SSL/TLS connections require extra treatment:
668 * When either CONN_SSL_WANT_WRITE or CONN_SSL_WANT_READ is set, we
669 * need to take care of that first, before checking read/write buffers.
670 * For instance, while we might have data in our write buffer, the
671 * TLS/SSL protocol might need to read internal data first for TLS/SSL
674 * If this function returns true, such a condition is met and we have
675 * to reverse the condition (check for read even if we've data to write,
676 * do not check for read but writeability even if write-buffer is empty).
678 * @param c Connection to check.
679 * @returns true if SSL-library has to read protocol data.
682 SSL_WantRead(const CONNECTION *c)
684 if (Conn_OPTION_ISSET(c, CONN_SSL_WANT_READ)) {
685 io_event_add(c->sock, IO_WANTREAD);
692 * Check if SSL library needs to write SSL-protocol related data.
694 * Please see description of SSL_WantRead() for full description!
696 * @param c Connection to check.
697 * @returns true if SSL-library has to write protocol data.
700 SSL_WantWrite(const CONNECTION *c)
702 if (Conn_OPTION_ISSET(c, CONN_SSL_WANT_WRITE)) {
703 io_event_add(c->sock, IO_WANTWRITE);
712 SSL_WantRead(UNUSED const CONNECTION *c)
716 SSL_WantWrite(UNUSED const CONNECTION *c)
723 * "Main Loop": Loop until shutdown or restart is signalled.
725 * This function loops until a shutdown or restart of ngIRCd is signalled and
726 * calls io_dispatch() to check for readable and writable sockets every second.
727 * It checks for status changes on pending connections (e. g. when a hostname
728 * has been resolved), checks for "penalties" and timeouts, and handles the
735 unsigned int wdatalen, bytes_processed;
739 while (!NGIRCd_SignalQuit && !NGIRCd_SignalRestart) {
742 /* Check configured servers and established links */
746 /* Expire outdated class/list items */
749 /* Look for non-empty read buffers ... */
750 for (i = 0; i < Pool_Size; i++) {
751 if ((My_Connections[i].sock > NONE)
752 && (array_bytes(&My_Connections[i].rbuf) > 0)
753 && (My_Connections[i].delaytime <= t)) {
754 /* ... and try to handle the received data */
755 bytes_processed = Handle_Buffer(i);
756 /* if we processed data, and there might be
757 * more commands in the input buffer, do not
758 * try to read any more data now */
759 if (bytes_processed &&
760 array_bytes(&My_Connections[i].rbuf) > 2) {
762 ("Throttling connection %d: command limit reached!",
764 Conn_SetPenalty(i, 1);
769 /* Look for non-empty write buffers ... */
770 for (i = 0; i < Pool_Size; i++) {
771 if (My_Connections[i].sock <= NONE)
774 wdatalen = (unsigned int)array_bytes(&My_Connections[i].wbuf);
777 array_bytes(&My_Connections[i].zip.wbuf) > 0)
782 if (SSL_WantRead(&My_Connections[i]))
784 io_event_add(My_Connections[i].sock,
789 /* Check from which sockets we possibly could read ... */
790 for (i = 0; i < Pool_Size; i++) {
791 if (My_Connections[i].sock <= NONE)
794 if (SSL_WantWrite(&My_Connections[i]))
795 continue; /* TLS/SSL layer needs to write data; deal with this first */
797 if (Proc_InProgress(&My_Connections[i].proc_stat)) {
798 /* Wait for completion of forked subprocess
799 * and ignore the socket in the meantime ... */
800 io_event_del(My_Connections[i].sock,
805 if (Conn_OPTION_ISSET(&My_Connections[i], CONN_ISCONNECTING))
806 /* Wait for completion of connect() ... */
809 if (My_Connections[i].delaytime > t) {
810 /* There is a "penalty time" set: ignore socket! */
811 io_event_del(My_Connections[i].sock,
816 io_event_add(My_Connections[i].sock, IO_WANTREAD);
819 /* Set the timeout for reading from the network to 1 second,
820 * which is the granularity with witch we handle "penalty
821 * times" for example.
822 * Note: tv_sec/usec are undefined(!) after io_dispatch()
823 * returns, so we have to set it beforce each call to it! */
827 /* Wait for activity ... */
828 i = io_dispatch(&tv);
829 if (i == -1 && errno != EINTR) {
830 Log(LOG_EMERG, "Conn_Handler(): io_dispatch(): %s!",
832 Log(LOG_ALERT, "%s exiting due to fatal errors!",
838 if (NGIRCd_SignalQuit)
839 Log(LOG_NOTICE | LOG_snotice, "Server going down NOW!");
840 else if (NGIRCd_SignalRestart)
841 Log(LOG_NOTICE | LOG_snotice, "Server restarting NOW!");
846 * Write a text string into the socket of a connection.
848 * This function automatically appends CR+LF to the string and validates that
849 * the result is a valid IRC message (oversized messages are shortened, for
850 * example). Then it calls the Conn_Write() function to do the actual sending.
852 * @param Idx Index fo the connection.
853 * @param Format Format string, see printf().
854 * @returns true on success, false otherwise.
858 Conn_WriteStr(CONN_ID Idx, const char *Format, ...)
861 Conn_WriteStr(Idx, Format, va_alist)
867 char buffer[COMMAND_LEN];
872 assert( Idx > NONE );
873 assert( Format != NULL );
876 va_start( ap, Format );
880 if (vsnprintf( buffer, COMMAND_LEN - 2, Format, ap ) >= COMMAND_LEN - 2 ) {
882 * The string that should be written to the socket is longer
883 * than the allowed size of COMMAND_LEN bytes (including both
884 * the CR and LF characters). This can be caused by the
885 * IRC_WriteXXX() functions when the prefix of this server had
886 * to be added to an already "quite long" command line which
887 * has been received from a regular IRC client, for example.
889 * We are not allowed to send such "oversized" messages to
890 * other servers and clients, see RFC 2812 2.3 and 2813 3.3
891 * ("these messages SHALL NOT exceed 512 characters in length,
892 * counting all characters including the trailing CR-LF").
894 * So we have a big problem here: we should send more bytes
895 * to the network than we are allowed to and we don't know
896 * the originator (any more). The "old" behaviour of blaming
897 * the receiver ("next hop") is a bad idea (it could be just
898 * an other server only routing the message!), so the only
899 * option left is to shorten the string and to hope that the
900 * result is still somewhat useful ...
904 strcpy (buffer + sizeof(buffer) - strlen(CUT_TXTSUFFIX) - 2 - 1,
910 Log(LOG_DEBUG, " -> connection %d: '%s'.", Idx, buffer);
913 len = strlcat( buffer, "\r\n", sizeof( buffer ));
914 ok = Conn_Write(Idx, buffer, len);
915 My_Connections[Idx].msg_out++;
919 } /* Conn_WriteStr */
923 * Append Data to the outbound write buffer of a connection.
925 * @param Idx Index of the connection.
926 * @param Data pointer to the data.
927 * @param Len length of Data.
928 * @returns true on success, false otherwise.
931 Conn_Write( CONN_ID Idx, char *Data, size_t Len )
934 size_t writebuf_limit = WRITEBUFFER_MAX_LEN;
935 assert( Idx > NONE );
936 assert( Data != NULL );
939 c = Conn_GetClient(Idx);
942 /* Servers do get special write buffer limits, so they can generate
943 * all the messages that are required while peering. */
944 if (Client_Type(c) == CLIENT_SERVER)
945 writebuf_limit = WRITEBUFFER_SLINK_LEN;
947 /* Is the socket still open? A previous call to Conn_Write()
948 * may have closed the connection due to a fatal error.
949 * In this case it is sufficient to return an error, as well. */
950 if( My_Connections[Idx].sock <= NONE ) {
951 LogDebug("Skipped write on closed socket (connection %d).", Idx);
956 if ( Conn_OPTION_ISSET( &My_Connections[Idx], CONN_ZIP )) {
958 * Zip_Buffer() does all the dirty work for us: it flushes
959 * the (pre-)compression buffers if required and handles
960 * all error conditions. */
961 if (!Zip_Buffer(Idx, Data, Len))
967 /* Uncompressed link:
968 * Check if outbound buffer has enough space for the data. */
969 if (array_bytes(&My_Connections[Idx].wbuf) + Len >=
970 WRITEBUFFER_FLUSH_LEN) {
971 /* Buffer is full, flush it. Handle_Write deals with
972 * low-level errors, if any. */
973 if (!Handle_Write(Idx))
977 /* When the write buffer is still too big after flushing it,
978 * the connection will be killed. */
979 if (array_bytes(&My_Connections[Idx].wbuf) + Len >=
982 "Write buffer space exhausted (connection %d, limit is %lu bytes, %lu bytes new, %lu bytes pending)",
983 Idx, writebuf_limit, Len,
984 (unsigned long)array_bytes(&My_Connections[Idx].wbuf));
985 Conn_Close(Idx, "Write buffer space exhausted", NULL, false);
989 /* Copy data to write buffer */
990 if (!array_catb(&My_Connections[Idx].wbuf, Data, Len))
993 My_Connections[Idx].bytes_out += Len;
996 /* Adjust global write counter */
1004 * Shut down a connection.
1006 * @param Idx Connection index.
1007 * @param LogMsg Message to write to the log or NULL. If no LogMsg
1008 * is given, the FwdMsg is logged.
1009 * @param FwdMsg Message to forward to remote servers.
1010 * @param InformClient If true, inform the client on the connection which is
1011 * to be shut down of the reason (FwdMsg) and send
1012 * connection statistics before disconnecting it.
1015 Conn_Close( CONN_ID Idx, const char *LogMsg, const char *FwdMsg, bool InformClient )
1017 /* Close connection. Open pipes of asyncronous resolver
1018 * sub-processes are closed down. */
1024 double in_z_k, out_z_k;
1028 assert( Idx > NONE );
1030 /* Is this link already shutting down? */
1031 if( Conn_OPTION_ISSET( &My_Connections[Idx], CONN_ISCLOSING )) {
1032 /* Conn_Close() has been called recursively for this link;
1033 * probabe reason: Handle_Write() failed -- see below. */
1034 LogDebug("Recursive request to close connection: %d", Idx );
1038 assert( My_Connections[Idx].sock > NONE );
1040 /* Mark link as "closing" */
1041 Conn_OPTION_ADD( &My_Connections[Idx], CONN_ISCLOSING );
1043 port = ng_ipaddr_getport(&My_Connections[Idx].addr);
1044 Log(LOG_INFO, "Shutting down connection %d (%s) with %s:%d ...", Idx,
1045 LogMsg ? LogMsg : FwdMsg, My_Connections[Idx].host, port);
1047 /* Search client, if any */
1048 c = Conn_GetClient( Idx );
1050 /* Should the client be informed? */
1053 /* Send statistics to client if registered as user: */
1054 if ((c != NULL) && (Client_Type(c) == CLIENT_USER)) {
1056 ":%s NOTICE %s :%sConnection statistics: client %.1f kb, server %.1f kb.",
1057 Client_ID(Client_ThisServer()), Client_ID(c),
1059 (double)My_Connections[Idx].bytes_in / 1024,
1060 (double)My_Connections[Idx].bytes_out / 1024);
1063 /* Send ERROR to client (see RFC 2812, section 3.1.7) */
1065 Conn_WriteStr(Idx, "ERROR :%s", FwdMsg);
1067 Conn_WriteStr(Idx, "ERROR :Closing connection");
1070 /* Try to write out the write buffer. Note: Handle_Write() eventually
1071 * removes the CLIENT structure associated with this connection if an
1072 * error occurs! So we have to re-check if there is still an valid
1073 * CLIENT structure after calling Handle_Write() ...*/
1074 (void)Handle_Write( Idx );
1076 /* Search client, if any (re-check!) */
1077 c = Conn_GetClient( Idx );
1079 if ( Conn_OPTION_ISSET( &My_Connections[Idx], CONN_SSL )) {
1080 Log(LOG_INFO, "SSL connection %d shutting down ...", Idx);
1081 ConnSSL_Free(&My_Connections[Idx]);
1084 /* Shut down socket */
1085 if (! io_close(My_Connections[Idx].sock)) {
1086 /* Oops, we can't close the socket!? This is ... ugly! */
1088 "Error closing connection %d (socket %d) with %s:%d - %s! (ignored)",
1089 Idx, My_Connections[Idx].sock, My_Connections[Idx].host,
1090 port, strerror(errno));
1093 /* Mark socket as invalid: */
1094 My_Connections[Idx].sock = NONE;
1096 /* If there is still a client, unregister it now */
1098 Client_Destroy(c, LogMsg, FwdMsg, true);
1100 /* Calculate statistics and log information */
1101 in_k = (double)My_Connections[Idx].bytes_in / 1024;
1102 out_k = (double)My_Connections[Idx].bytes_out / 1024;
1104 if (Conn_OPTION_ISSET( &My_Connections[Idx], CONN_ZIP)) {
1105 in_z_k = (double)My_Connections[Idx].zip.bytes_in / 1024;
1106 out_z_k = (double)My_Connections[Idx].zip.bytes_out / 1024;
1107 /* Make sure that no division by zero can occur during
1108 * the calculation of in_p and out_p: in_z_k and out_z_k
1109 * are non-zero, that's guaranteed by the protocol until
1110 * compression can be enabled. */
1115 in_p = (int)(( in_k * 100 ) / in_z_k );
1116 out_p = (int)(( out_k * 100 ) / out_z_k );
1118 "Connection %d with %s:%d closed (in: %.1fk/%.1fk/%d%%, out: %.1fk/%.1fk/%d%%).",
1119 Idx, My_Connections[Idx].host, port,
1120 in_k, in_z_k, in_p, out_k, out_z_k, out_p);
1126 "Connection %d with %s:%d closed (in: %.1fk, out: %.1fk).",
1127 Idx, My_Connections[Idx].host, port,
1131 /* Servers: Modify time of next connect attempt? */
1132 Conf_UnsetServer( Idx );
1135 /* Clean up zlib, if link was compressed */
1136 if ( Conn_OPTION_ISSET( &My_Connections[Idx], CONN_ZIP )) {
1137 inflateEnd( &My_Connections[Idx].zip.in );
1138 deflateEnd( &My_Connections[Idx].zip.out );
1139 array_free(&My_Connections[Idx].zip.rbuf);
1140 array_free(&My_Connections[Idx].zip.wbuf);
1144 array_free(&My_Connections[Idx].rbuf);
1145 array_free(&My_Connections[Idx].wbuf);
1147 /* Clean up connection structure (=free it) */
1148 Init_Conn_Struct( Idx );
1150 assert(NumConnections > 0);
1153 LogDebug("Shutdown of connection %d completed, %ld connection%s left.",
1154 Idx, NumConnections, NumConnections != 1 ? "s" : "");
1159 * Get current number of connections.
1161 * @returns Number of current connections.
1166 return NumConnections;
1171 * Get number of maximum simultaneous connections.
1173 * @returns Number of maximum simultaneous connections.
1178 return NumConnectionsMax;
1179 } /* Conn_CountMax */
1183 * Get number of connections accepted since the daemon startet.
1185 * @returns Number of connections accepted.
1188 Conn_CountAccepted(void)
1190 return NumConnectionsAccepted;
1191 } /* Conn_CountAccepted */
1195 * Synchronize established connections and configured server structures
1196 * after a configuration update and store the correct connection IDs, if any.
1199 Conn_SyncServerStruct(void)
1205 for (i = 0; i < Pool_Size; i++) {
1206 if (My_Connections[i].sock == NONE)
1210 client = Conn_GetClient(i);
1211 if (!client || Client_Type(client) != CLIENT_SERVER)
1214 for (c = 0; c < MAX_SERVERS; c++) {
1215 /* Configured server? */
1216 if (!Conf_Server[c].host[0])
1219 if (strcasecmp(Conf_Server[c].name, Client_ID(client)) == 0)
1220 Conf_Server[c].conn_id = i;
1223 } /* SyncServerStruct */
1227 * Send out data of write buffer; connect new sockets.
1229 * @param Idx Connection index.
1230 * @returns true on success, false otherwise.
1233 Handle_Write( CONN_ID Idx )
1238 assert( Idx > NONE );
1239 if ( My_Connections[Idx].sock < 0 ) {
1240 LogDebug("Handle_Write() on closed socket, connection %d", Idx);
1243 assert( My_Connections[Idx].sock > NONE );
1245 wdatalen = array_bytes(&My_Connections[Idx].wbuf );
1248 if (wdatalen == 0) {
1249 /* Write buffer is empty, so we try to flush the compression
1250 * buffer and get some data to work with from there :-) */
1251 if (!Zip_Flush(Idx))
1254 /* Now the write buffer most probably has changed: */
1255 wdatalen = array_bytes(&My_Connections[Idx].wbuf);
1259 if (wdatalen == 0) {
1260 /* Still no data, fine. */
1261 io_event_del(My_Connections[Idx].sock, IO_WANTWRITE );
1267 ("Handle_Write() called for connection %d, %ld bytes pending ...",
1272 if ( Conn_OPTION_ISSET( &My_Connections[Idx], CONN_SSL )) {
1273 len = ConnSSL_Write(&My_Connections[Idx], array_start(&My_Connections[Idx].wbuf), wdatalen);
1277 len = write(My_Connections[Idx].sock,
1278 array_start(&My_Connections[Idx].wbuf), wdatalen );
1281 if (errno == EAGAIN || errno == EINTR)
1284 Log(LOG_ERR, "Write error on connection %d (socket %d): %s!",
1285 Idx, My_Connections[Idx].sock, strerror(errno));
1286 Conn_Close(Idx, "Write error!", NULL, false);
1290 /* move any data not yet written to beginning */
1291 array_moveleft(&My_Connections[Idx].wbuf, 1, (size_t)len);
1294 } /* Handle_Write */
1298 * Count established connections to a specific IP address.
1300 * @returns Number of established connections.
1303 Count_Connections(ng_ipaddr_t *a)
1308 for (i = 0; i < Pool_Size; i++) {
1309 if (My_Connections[i].sock <= NONE)
1311 if (ng_ipaddr_ipequal(&My_Connections[i].addr, a))
1315 } /* Count_Connections */
1319 * Initialize new client connection on a listening socket.
1321 * @param Sock Listening socket descriptor.
1322 * @returns Accepted socket descriptor or -1 on error.
1325 New_Connection(int Sock)
1328 struct request_info req;
1330 ng_ipaddr_t new_addr;
1331 char ip_str[NG_INET_ADDRSTRLEN];
1332 int new_sock, new_sock_len, identsock;
1336 assert(Sock > NONE);
1338 LogDebug("Accepting new connection on socket %d ...", Sock);
1340 new_sock_len = (int)sizeof(new_addr);
1341 new_sock = accept(Sock, (struct sockaddr *)&new_addr,
1342 (socklen_t *)&new_sock_len);
1344 Log(LOG_CRIT, "Can't accept connection: %s!", strerror(errno));
1347 NumConnectionsAccepted++;
1349 if (!ng_ipaddr_tostr_r(&new_addr, ip_str)) {
1350 Log(LOG_CRIT, "fd %d: Can't convert IP address!", new_sock);
1351 Simple_Message(new_sock, "ERROR :Internal Server Error");
1357 /* Validate socket using TCP Wrappers */
1358 request_init(&req, RQ_DAEMON, PACKAGE_NAME, RQ_FILE, new_sock,
1359 RQ_CLIENT_SIN, &new_addr, NULL);
1361 if (!hosts_access(&req)) {
1363 "Refused connection from %s (by TCP Wrappers)!", ip_str);
1364 Simple_Message(new_sock, "ERROR :Connection refused");
1370 if (!Init_Socket(new_sock))
1373 /* Check global connection limit */
1374 if ((Conf_MaxConnections > 0) &&
1375 (NumConnections >= (size_t) Conf_MaxConnections)) {
1376 Log(LOG_ALERT, "Can't accept connection: limit (%d) reached!",
1377 Conf_MaxConnections);
1378 Simple_Message(new_sock, "ERROR :Connection limit reached");
1383 /* Check IP-based connection limit */
1384 cnt = Count_Connections(&new_addr);
1385 if ((Conf_MaxConnectionsIP > 0) && (cnt >= Conf_MaxConnectionsIP)) {
1386 /* Access denied, too many connections from this IP address! */
1388 "Refused connection from %s: too may connections (%ld) from this IP address!",
1390 Simple_Message(new_sock,
1391 "ERROR :Connection refused, too many connections from your IP address");
1396 if (new_sock >= Pool_Size) {
1397 if (!array_alloc(&My_ConnArray, sizeof(CONNECTION),
1398 (size_t) new_sock)) {
1400 "Can't allocate memory! [New_Connection]");
1401 Simple_Message(new_sock, "ERROR: Internal error");
1405 LogDebug("Bumped connection pool to %ld items (internal: %ld items, %ld bytes)",
1406 new_sock, array_length(&My_ConnArray,
1407 sizeof(CONNECTION)), array_bytes(&My_ConnArray));
1409 /* Adjust pointer to new block */
1410 My_Connections = array_start(&My_ConnArray);
1411 while (Pool_Size <= new_sock)
1412 Init_Conn_Struct(Pool_Size++);
1415 /* register callback */
1416 if (!io_event_create(new_sock, IO_WANTREAD, cb_clientserver)) {
1418 "Can't accept connection: io_event_create failed!");
1419 Simple_Message(new_sock, "ERROR :Internal error");
1424 c = Client_NewLocal(new_sock, ip_str, CLIENT_UNKNOWN, false);
1427 "Can't accept connection: can't create client structure!");
1428 Simple_Message(new_sock, "ERROR :Internal error");
1433 Init_Conn_Struct(new_sock);
1434 My_Connections[new_sock].sock = new_sock;
1435 My_Connections[new_sock].addr = new_addr;
1436 My_Connections[new_sock].client = c;
1438 /* Set initial hostname to IP address. This becomes overwritten when
1439 * the DNS lookup is enabled and succeeds, but is used otherwise. */
1440 if (ng_ipaddr_af(&new_addr) != AF_INET)
1441 snprintf(My_Connections[new_sock].host,
1442 sizeof(My_Connections[new_sock].host), "[%s]", ip_str);
1444 strlcpy(My_Connections[new_sock].host, ip_str,
1445 sizeof(My_Connections[new_sock].host));
1447 Client_SetHostname(c, My_Connections[new_sock].host);
1449 Log(LOG_INFO, "Accepted connection %d from %s:%d on socket %d.",
1450 new_sock, My_Connections[new_sock].host,
1451 ng_ipaddr_getport(&new_addr), Sock);
1453 identsock = new_sock;
1459 if (Conf_NoticeAuth) {
1462 (void)Conn_WriteStr(new_sock,
1463 "NOTICE AUTH :*** Looking up your hostname and checking ident");
1466 (void)Conn_WriteStr(new_sock,
1467 "NOTICE AUTH :*** Looking up your hostname");
1469 Resolve_Addr(&My_Connections[new_sock].proc_stat, &new_addr,
1470 identsock, cb_Read_Resolver_Result);
1473 Account_Connection();
1475 } /* New_Connection */
1479 * Update global connection counters.
1482 Account_Connection(void)
1485 if (NumConnections > NumConnectionsMax)
1486 NumConnectionsMax = NumConnections;
1487 LogDebug("Total number of connections now %lu (max %lu).",
1488 NumConnections, NumConnectionsMax);
1489 } /* Account_Connection */
1493 * Translate socket handle into connection index.
1495 * @param Sock Socket handle.
1496 * @returns Connecion index or NONE, if no connection could be found.
1499 Socket2Index( int Sock )
1501 assert( Sock >= 0 );
1503 if( Sock >= Pool_Size || My_Connections[Sock].sock != Sock ) {
1504 /* the Connection was already closed again, likely due to
1506 LogDebug("Socket2Index: can't get connection for socket %d!", Sock);
1510 } /* Socket2Index */
1514 * Read data from the network to the read buffer. If an error occures,
1515 * the socket of this connection will be shut down.
1517 * @param Idx Connection index.
1520 Read_Request( CONN_ID Idx )
1523 static const unsigned int maxbps = COMMAND_LEN / 2;
1524 char readbuf[READBUFFER_LEN];
1527 assert( Idx > NONE );
1528 assert( My_Connections[Idx].sock > NONE );
1531 if ((array_bytes(&My_Connections[Idx].rbuf) >= READBUFFER_LEN) ||
1532 (array_bytes(&My_Connections[Idx].zip.rbuf) >= READBUFFER_LEN))
1534 if (array_bytes(&My_Connections[Idx].rbuf) >= READBUFFER_LEN)
1537 /* Read buffer is full */
1539 "Receive buffer space exhausted (connection %d): %d bytes",
1540 Idx, array_bytes(&My_Connections[Idx].rbuf));
1541 Conn_Close(Idx, "Receive buffer space exhausted", NULL, false);
1546 if (Conn_OPTION_ISSET(&My_Connections[Idx], CONN_SSL))
1547 len = ConnSSL_Read( &My_Connections[Idx], readbuf, sizeof(readbuf));
1550 len = read(My_Connections[Idx].sock, readbuf, sizeof(readbuf));
1552 Log(LOG_INFO, "%s:%u (%s) is closing the connection ...",
1553 My_Connections[Idx].host,
1554 (unsigned int) ng_ipaddr_getport(&My_Connections[Idx].addr),
1555 ng_ipaddr_tostr(&My_Connections[Idx].addr));
1557 "Socket closed!", "Client closed connection",
1563 if( errno == EAGAIN ) return;
1564 Log(LOG_ERR, "Read error on connection %d (socket %d): %s!",
1565 Idx, My_Connections[Idx].sock, strerror(errno));
1566 Conn_Close(Idx, "Read error!", "Client closed connection",
1571 if (Conn_OPTION_ISSET(&My_Connections[Idx], CONN_ZIP)) {
1572 if (!array_catb(&My_Connections[Idx].zip.rbuf, readbuf,
1575 "Could not append recieved data to zip input buffer (connection %d): %d bytes!",
1577 Conn_Close(Idx, "Receive buffer space exhausted", NULL,
1584 if (!array_catb( &My_Connections[Idx].rbuf, readbuf, len)) {
1586 "Could not append recieved data to input buffer (connection %d): %d bytes!",
1588 Conn_Close(Idx, "Receive buffer space exhausted", NULL, false );
1592 /* Update connection statistics */
1593 My_Connections[Idx].bytes_in += len;
1594 My_Connections[Idx].bps += Handle_Buffer(Idx);
1596 /* Make sure that there is still a valid client registered */
1597 c = Conn_GetClient(Idx);
1601 /* Update timestamp of last data received if this connection is
1602 * registered as a user, server or service connection. Don't update
1603 * otherwise, so users have at least Conf_PongTimeout seconds time to
1604 * register with the IRC server -- see Check_Connections().
1605 * Update "lastping", too, if time shifted backwards ... */
1606 if (Client_Type(c) == CLIENT_USER
1607 || Client_Type(c) == CLIENT_SERVER
1608 || Client_Type(c) == CLIENT_SERVICE) {
1610 if (My_Connections[Idx].lastdata != t)
1611 My_Connections[Idx].bps = 0;
1613 My_Connections[Idx].lastdata = t;
1614 if (My_Connections[Idx].lastping > t)
1615 My_Connections[Idx].lastping = t;
1618 /* Look at the data in the (read-) buffer of this connection */
1619 if (Client_Type(c) != CLIENT_SERVER
1620 && Client_Type(c) != CLIENT_UNKNOWNSERVER
1621 && Client_Type(c) != CLIENT_SERVICE
1622 && My_Connections[Idx].bps >= maxbps) {
1623 LogDebug("Throttling connection %d: BPS exceeded! (%u >= %u)",
1624 Idx, My_Connections[Idx].bps, maxbps);
1625 Conn_SetPenalty(Idx, 1);
1627 } /* Read_Request */
1631 * Handle all data in the connection read-buffer.
1633 * Data is processed until no complete command is left in the read buffer,
1634 * or MAX_COMMANDS[_SERVER|_SERVICE] commands were processed.
1635 * When a fatal error occurs, the connection is shut down.
1637 * @param Idx Index of the connection.
1638 * @returns Number of bytes processed.
1641 Handle_Buffer(CONN_ID Idx)
1644 char *ptr1, *ptr2, *first_eol;
1652 unsigned int i, maxcmd = MAX_COMMANDS, len_processed = 0;
1655 c = Conn_GetClient(Idx);
1656 starttime = time(NULL);
1660 /* Servers do get special command limits, so they can process
1661 * all the messages that are required while peering. */
1662 switch (Client_Type(c)) {
1664 /* Allow servers to send more commands in the first 10 secods
1665 * to speed up server login and network synchronisation. */
1666 if (starttime - Client_StartTime(c) < 10)
1667 maxcmd = MAX_COMMANDS_SERVER * 5;
1669 maxcmd = MAX_COMMANDS_SERVER;
1671 case CLIENT_SERVICE:
1672 maxcmd = MAX_COMMANDS_SERVICE; break;
1675 for (i=0; i < maxcmd; i++) {
1677 if (My_Connections[Idx].delaytime > starttime)
1680 /* Unpack compressed data, if compression is in use */
1681 if (Conn_OPTION_ISSET(&My_Connections[Idx], CONN_ZIP)) {
1682 /* When unzipping fails, Unzip_Buffer() shuts
1683 * down the connection itself */
1684 if (!Unzip_Buffer(Idx))
1689 if (0 == array_bytes(&My_Connections[Idx].rbuf))
1692 /* Make sure that the buffer is NULL terminated */
1693 if (!array_cat0_temporary(&My_Connections[Idx].rbuf)) {
1694 Conn_Close(Idx, NULL,
1695 "Can't allocate memory [Handle_Buffer]",
1700 /* RFC 2812, section "2.3 Messages", 5th paragraph:
1701 * "IRC messages are always lines of characters terminated
1702 * with a CR-LF (Carriage Return - Line Feed) pair [...]". */
1704 ptr = strstr(array_start(&My_Connections[Idx].rbuf), "\r\n");
1707 /* Check for non-RFC-compliant request (only CR or LF)?
1708 * Unfortunately, there are quite a few clients out there
1709 * that do this -- e. g. mIRC, BitchX, and Trillian :-( */
1710 ptr1 = strchr(array_start(&My_Connections[Idx].rbuf), '\r');
1711 ptr2 = strchr(array_start(&My_Connections[Idx].rbuf), '\n');
1713 /* Check if there is a single CR or LF _before_ the
1714 * corerct CR+LF line terminator: */
1715 first_eol = ptr1 < ptr2 ? ptr1 : ptr2;
1716 if (first_eol < ptr) {
1717 /* Single CR or LF before CR+LF found */
1721 } else if (ptr1 || ptr2) {
1722 /* No CR+LF terminated command found, but single
1723 * CR or LF found ... */
1725 ptr = ptr1 < ptr2 ? ptr1 : ptr2;
1727 ptr = ptr1 ? ptr1 : ptr2;
1735 /* Complete (=line terminated) request found, handle it! */
1738 len = ptr - (char *)array_start(&My_Connections[Idx].rbuf) + delta;
1740 if (len > (COMMAND_LEN - 1)) {
1741 /* Request must not exceed 512 chars (incl. CR+LF!),
1742 * see RFC 2812. Disconnect Client if this happens. */
1744 "Request too long (connection %d): %d bytes (max. %d expected)!",
1745 Idx, array_bytes(&My_Connections[Idx].rbuf),
1747 Conn_Close(Idx, NULL, "Request too long", true);
1751 len_processed += (unsigned int)len;
1753 /* Request is empty (only '\r\n', '\r' or '\n');
1754 * delta is 2 ('\r\n') or 1 ('\r' or '\n'), see above */
1755 array_moveleft(&My_Connections[Idx].rbuf, 1, len);
1759 /* remember if stream is already compressed */
1760 old_z = My_Connections[Idx].options & CONN_ZIP;
1763 My_Connections[Idx].msg_in++;
1765 (Idx, (char *)array_start(&My_Connections[Idx].rbuf)))
1766 return 0; /* error -> connection has been closed */
1768 array_moveleft(&My_Connections[Idx].rbuf, 1, len);
1770 LogDebug("Connection %d: %d bytes left in read buffer.",
1771 Idx, array_bytes(&My_Connections[Idx].rbuf));
1774 if ((!old_z) && (My_Connections[Idx].options & CONN_ZIP) &&
1775 (array_bytes(&My_Connections[Idx].rbuf) > 0)) {
1776 /* The last command activated socket compression.
1777 * Data that was read after that needs to be copied
1778 * to the unzip buffer for decompression: */
1780 (&My_Connections[Idx].zip.rbuf,
1781 &My_Connections[Idx].rbuf)) {
1782 Conn_Close(Idx, NULL,
1783 "Can't allocate memory [Handle_Buffer]",
1788 array_trunc(&My_Connections[Idx].rbuf);
1790 ("Moved already received data (%u bytes) to uncompression buffer.",
1791 array_bytes(&My_Connections[Idx].zip.rbuf));
1795 return len_processed;
1796 } /* Handle_Buffer */
1800 * Check whether established connections are still alive or not.
1801 * If not, play PING-PONG first; and if that doesn't help either,
1802 * disconnect the respective peer.
1805 Check_Connections(void)
1811 for (i = 0; i < Pool_Size; i++) {
1812 if (My_Connections[i].sock < 0)
1815 c = Conn_GetClient(i);
1816 if (c && ((Client_Type(c) == CLIENT_USER)
1817 || (Client_Type(c) == CLIENT_SERVER)
1818 || (Client_Type(c) == CLIENT_SERVICE))) {
1819 /* connected User, Server or Service */
1820 if (My_Connections[i].lastping >
1821 My_Connections[i].lastdata) {
1822 /* We already sent a ping */
1823 if (My_Connections[i].lastping <
1824 time(NULL) - Conf_PongTimeout) {
1827 ("Connection %d: Ping timeout: %d seconds.",
1828 i, Conf_PongTimeout);
1829 snprintf(msg, sizeof(msg), "Ping timeout: %d seconds", Conf_PongTimeout);
1830 Conn_Close(i, NULL, msg, true);
1832 } else if (My_Connections[i].lastdata <
1833 time(NULL) - Conf_PingTimeout) {
1834 /* We need to send a PING ... */
1835 LogDebug("Connection %d: sending PING ...", i);
1836 My_Connections[i].lastping = time(NULL);
1837 Conn_WriteStr(i, "PING :%s",
1838 Client_ID(Client_ThisServer()));
1841 /* The connection is not fully established yet, so
1842 * we don't do the PING-PONG game here but instead
1843 * disconnect the client after "a short time" if it's
1844 * still not registered. */
1846 if (My_Connections[i].lastdata <
1847 time(NULL) - Conf_PongTimeout) {
1849 ("Unregistered connection %d timed out ...",
1851 Conn_Close(i, NULL, "Timeout", false);
1855 } /* Check_Connections */
1859 * Check if further server links should be established.
1867 time_now = time(NULL);
1869 /* Check all configured servers */
1870 for (i = 0; i < MAX_SERVERS; i++) {
1871 if (Conf_Server[i].conn_id != NONE)
1872 continue; /* Already establishing or connected */
1873 if (!Conf_Server[i].host[0] || !Conf_Server[i].port > 0)
1874 continue; /* No host and/or port configured */
1875 if (Conf_Server[i].flags & CONF_SFLAG_DISABLED)
1876 continue; /* Disabled configuration entry */
1877 if (Conf_Server[i].lasttry > (time_now - Conf_ConnectRetry))
1878 continue; /* We have to wait a little bit ... */
1880 /* Is there already a connection in this group? */
1881 if (Conf_Server[i].group > NONE) {
1882 for (n = 0; n < MAX_SERVERS; n++) {
1885 if ((Conf_Server[n].conn_id != NONE) &&
1886 (Conf_Server[n].group == Conf_Server[i].group))
1889 if (n < MAX_SERVERS)
1893 /* Okay, try to connect now */
1895 "Preparing to establish a new server link for \"%s\" ...",
1896 Conf_Server[i].name);
1897 Conf_Server[i].lasttry = time_now;
1898 Conf_Server[i].conn_id = SERVER_WAIT;
1899 assert(Proc_GetPipeFd(&Conf_Server[i].res_stat) < 0);
1900 Resolve_Name(&Conf_Server[i].res_stat, Conf_Server[i].host,
1901 cb_Connect_to_Server);
1903 } /* Check_Servers */
1907 * Establish a new outgoing server connection.
1909 * @param Server Configuration index of the server.
1910 * @param dest Destination IP address to connect to.
1913 New_Server( int Server , ng_ipaddr_t *dest)
1915 /* Establish new server link */
1916 char ip_str[NG_INET_ADDRSTRLEN];
1917 int af_dest, res, new_sock;
1920 assert( Server > NONE );
1922 if (!ng_ipaddr_tostr_r(dest, ip_str)) {
1923 Log(LOG_WARNING, "New_Server: Could not convert IP to string");
1927 af_dest = ng_ipaddr_af(dest);
1928 new_sock = socket(af_dest, SOCK_STREAM, 0);
1931 "Establishing connection for \"%s\" to \"%s:%d\" (%s), socket %d ...",
1932 Conf_Server[Server].name, Conf_Server[Server].host,
1933 Conf_Server[Server].port, ip_str, new_sock);
1936 Log(LOG_CRIT, "Can't create socket (af %d): %s!",
1937 af_dest, strerror(errno));
1941 if (!Init_Socket(new_sock))
1944 /* is a bind address configured? */
1945 res = ng_ipaddr_af(&Conf_Server[Server].bind_addr);
1946 /* if yes, bind now. If it fails, warn and let connect() pick a source address */
1947 if (res && bind(new_sock, (struct sockaddr *) &Conf_Server[Server].bind_addr,
1948 ng_ipaddr_salen(&Conf_Server[Server].bind_addr)))
1950 ng_ipaddr_tostr_r(&Conf_Server[Server].bind_addr, ip_str);
1951 Log(LOG_WARNING, "Can't bind socket to %s: %s!", ip_str, strerror(errno));
1953 ng_ipaddr_setport(dest, Conf_Server[Server].port);
1954 res = connect(new_sock, (struct sockaddr *) dest, ng_ipaddr_salen(dest));
1955 if(( res != 0 ) && ( errno != EINPROGRESS )) {
1956 Log( LOG_CRIT, "Can't connect socket: %s!", strerror( errno ));
1961 if (!array_alloc(&My_ConnArray, sizeof(CONNECTION), (size_t)new_sock)) {
1963 "Cannot allocate memory for server connection (socket %d)",
1969 if (!io_event_create( new_sock, IO_WANTWRITE, cb_connserver)) {
1970 Log(LOG_ALERT, "io_event_create(): could not add fd %d", strerror(errno));
1975 My_Connections = array_start(&My_ConnArray);
1977 assert(My_Connections[new_sock].sock <= 0);
1979 Init_Conn_Struct(new_sock);
1981 ng_ipaddr_tostr_r(dest, ip_str);
1982 c = Client_NewLocal(new_sock, ip_str, CLIENT_UNKNOWNSERVER, false);
1984 Log( LOG_ALERT, "Can't establish connection: can't create client structure!" );
1989 /* Conn_Close() decrements this counter again */
1990 Account_Connection();
1991 Client_SetIntroducer( c, c );
1992 Client_SetToken( c, TOKEN_OUTBOUND );
1994 /* Register connection */
1995 Conf_Server[Server].conn_id = new_sock;
1996 My_Connections[new_sock].sock = new_sock;
1997 My_Connections[new_sock].addr = *dest;
1998 My_Connections[new_sock].client = c;
1999 strlcpy( My_Connections[new_sock].host, Conf_Server[Server].host,
2000 sizeof(My_Connections[new_sock].host ));
2003 if (Conf_Server[Server].SSLConnect && !ConnSSL_PrepareConnect( &My_Connections[new_sock],
2004 &Conf_Server[Server] ))
2006 Log(LOG_ALERT, "Could not initialize SSL for outgoing connection");
2007 Conn_Close( new_sock, "Could not initialize SSL for outgoing connection", NULL, false );
2008 Init_Conn_Struct( new_sock );
2009 Conf_Server[Server].conn_id = NONE;
2013 LogDebug("Registered new connection %d on socket %d (%ld in total).",
2014 new_sock, My_Connections[new_sock].sock, NumConnections);
2015 Conn_OPTION_ADD( &My_Connections[new_sock], CONN_ISCONNECTING );
2020 * Initialize connection structure.
2022 * @param Idx Connection index.
2025 Init_Conn_Struct(CONN_ID Idx)
2027 time_t now = time(NULL);
2029 memset(&My_Connections[Idx], 0, sizeof(CONNECTION));
2030 My_Connections[Idx].sock = -1;
2031 My_Connections[Idx].signon = now;
2032 My_Connections[Idx].lastdata = now;
2033 My_Connections[Idx].lastprivmsg = now;
2034 Proc_InitStruct(&My_Connections[Idx].proc_stat);
2035 } /* Init_Conn_Struct */
2039 * Initialize options of a new socket.
2041 * For example, we try to set socket options SO_REUSEADDR and IPTOS_LOWDELAY.
2042 * The socket is automatically closed if a fatal error is encountered.
2044 * @param Sock Socket handle.
2045 * @returns false if socket was closed due to fatal error.
2048 Init_Socket( int Sock )
2052 if (!io_setnonblock(Sock)) {
2053 Log( LOG_CRIT, "Can't enable non-blocking mode for socket: %s!", strerror( errno ));
2058 /* Don't block this port after socket shutdown */
2060 if( setsockopt( Sock, SOL_SOCKET, SO_REUSEADDR, &value, (socklen_t)sizeof( value )) != 0 )
2062 Log( LOG_ERR, "Can't set socket option SO_REUSEADDR: %s!", strerror( errno ));
2063 /* ignore this error */
2066 /* Set type of service (TOS) */
2067 #if defined(IPPROTO_IP) && defined(IPTOS_LOWDELAY)
2068 value = IPTOS_LOWDELAY;
2069 if (setsockopt(Sock, IPPROTO_IP, IP_TOS, &value,
2070 (socklen_t) sizeof(value))) {
2071 LogDebug("Can't set socket option IP_TOS: %s!",
2073 /* ignore this error */
2075 LogDebug("IP_TOS on socket %d has been set to IPTOS_LOWDELAY.",
2084 * Read results of a resolver sub-process and try to initiate a new server
2087 * @param fd File descriptor of the pipe to the sub-process.
2088 * @param events (ignored IO specification)
2091 cb_Connect_to_Server(int fd, UNUSED short events)
2093 /* Read result of resolver sub-process from pipe and start connection */
2096 ng_ipaddr_t dest_addrs[4]; /* we can handle at most 3; but we read up to
2097 four so we can log the 'more than we can handle'
2098 condition. First result is tried immediately, rest
2099 is saved for later if needed. */
2101 LogDebug("Resolver: Got forward lookup callback on fd %d, events %d", fd, events);
2103 for (i=0; i < MAX_SERVERS; i++) {
2104 if (Proc_GetPipeFd(&Conf_Server[i].res_stat) == fd )
2108 if( i >= MAX_SERVERS) {
2109 /* Ops, no matching server found?! */
2111 LogDebug("Resolver: Got Forward Lookup callback for unknown server!?");
2115 /* Read result from pipe */
2116 len = Proc_Read(&Conf_Server[i].res_stat, dest_addrs, sizeof(dest_addrs));
2117 Proc_Close(&Conf_Server[i].res_stat);
2119 /* Error resolving hostname: reset server structure */
2120 Conf_Server[i].conn_id = NONE;
2124 assert((len % sizeof(ng_ipaddr_t)) == 0);
2126 LogDebug("Got result from resolver: %u structs (%u bytes).", len/sizeof(ng_ipaddr_t), len);
2128 memset(&Conf_Server[i].dst_addr, 0, sizeof(Conf_Server[i].dst_addr));
2129 if (len > sizeof(ng_ipaddr_t)) {
2130 /* more than one address for this hostname, remember them
2131 * in case first address is unreachable/not available */
2132 len -= sizeof(ng_ipaddr_t);
2133 if (len > sizeof(Conf_Server[i].dst_addr)) {
2134 len = sizeof(Conf_Server[i].dst_addr);
2136 "Notice: Resolver returned more IP Addresses for host than we can handle, additional addresses dropped.");
2138 memcpy(&Conf_Server[i].dst_addr, &dest_addrs[1], len);
2141 New_Server(i, dest_addrs);
2142 } /* cb_Read_Forward_Lookup */
2146 * Read results of a resolver sub-process from the pipe and update the
2147 * apropriate connection/client structure(s): hostname and/or IDENT user name.
2149 * @param r_fd File descriptor of the pipe to the sub-process.
2150 * @param events (ignored IO specification)
2153 cb_Read_Resolver_Result( int r_fd, UNUSED short events )
2160 char readbuf[HOST_LEN + 2 + CLIENT_USER_LEN];
2162 char readbuf[HOST_LEN + 1];
2165 LogDebug("Resolver: Got callback on fd %d, events %d", r_fd, events );
2166 i = Conn_GetFromProc(r_fd);
2168 /* Ops, none found? Probably the connection has already
2169 * been closed!? We'll ignore that ... */
2171 LogDebug("Resolver: Got callback for unknown connection!?");
2175 /* Read result from pipe */
2176 len = Proc_Read(&My_Connections[i].proc_stat, readbuf, sizeof readbuf -1);
2177 Proc_Close(&My_Connections[i].proc_stat);
2181 readbuf[len] = '\0';
2182 identptr = strchr(readbuf, '\n');
2183 assert(identptr != NULL);
2185 Log( LOG_CRIT, "Resolver: Got malformed result!");
2190 LogDebug("Got result from resolver: \"%s\" (%u bytes read).", readbuf, len);
2191 /* Okay, we got a complete result: this is a host name for outgoing
2192 * connections and a host name and IDENT user name (if enabled) for
2193 * incoming connections.*/
2194 assert ( My_Connections[i].sock >= 0 );
2195 /* Incoming connection. Search client ... */
2196 c = Conn_GetClient( i );
2197 assert( c != NULL );
2199 /* Only update client information of unregistered clients.
2200 * Note: user commands (e. g. WEBIRC) are always read _after_ reading
2201 * the resolver results, so we don't have to worry to override settings
2202 * from these commands here. */
2203 if(Client_Type(c) == CLIENT_UNKNOWN) {
2204 strlcpy(My_Connections[i].host, readbuf,
2205 sizeof(My_Connections[i].host));
2206 Client_SetHostname(c, readbuf);
2207 if (Conf_NoticeAuth)
2208 (void)Conn_WriteStr(i,
2209 "NOTICE AUTH :*** Found your hostname");
2213 Log(LOG_INFO, "IDENT lookup for connection %d: \"%s\".", i, identptr);
2214 Client_SetUser(c, identptr, true);
2215 if (Conf_NoticeAuth)
2216 (void)Conn_WriteStr(i,
2217 "NOTICE AUTH :*** Got ident response");
2219 Log(LOG_INFO, "IDENT lookup for connection %d: no result.", i);
2220 if (Conf_NoticeAuth && Conf_Ident)
2221 (void)Conn_WriteStr(i,
2222 "NOTICE AUTH :*** No ident response");
2227 else Log( LOG_DEBUG, "Resolver: discarding result for already registered connection %d.", i );
2229 } /* cb_Read_Resolver_Result */
2233 * Write a "simple" (error) message to a socket.
2235 * The message is sent without using the connection write buffers, without
2236 * compression/encryption, and even without any error reporting. It is
2237 * designed for error messages of e.g. New_Connection().
2239 * @param Sock Socket handle.
2240 * @param Msg Message string to send.
2243 Simple_Message(int Sock, const char *Msg)
2245 char buf[COMMAND_LEN];
2248 assert(Sock > NONE);
2249 assert(Msg != NULL);
2251 strlcpy(buf, Msg, sizeof buf - 2);
2252 len = strlcat(buf, "\r\n", sizeof buf);
2253 if (write(Sock, buf, len) < 0) {
2254 /* Because this function most probably got called to log
2255 * an error message, any write error is ignored here to
2256 * avoid an endless loop. But casting the result of write()
2257 * to "void" doesn't satisfy the GNU C code attribute
2258 * "warn_unused_result" which is used by some versions of
2259 * glibc (e.g. 2.11.1), therefore this silly error
2260 * "handling" code here :-( */
2263 } /* Simple_Error */
2267 * Get CLIENT structure that belongs to a local connection identified by its
2268 * index number. Each connection belongs to a client by definition, so it is
2269 * not required that the caller checks for NULL return values.
2271 * @param Idx Connection index number.
2272 * @returns Pointer to CLIENT structure.
2275 Conn_GetClient( CONN_ID Idx )
2280 c = array_get(&My_ConnArray, sizeof (CONNECTION), (size_t)Idx);
2282 return c ? c->client : NULL;
2286 * Get PROC_STAT sub-process structure of a connection.
2288 * @param Idx Connection index number.
2289 * @returns PROC_STAT structure.
2292 Conn_GetProcStat(CONN_ID Idx)
2297 c = array_get(&My_ConnArray, sizeof (CONNECTION), (size_t)Idx);
2299 return &c->proc_stat;
2300 } /* Conn_GetProcStat */
2304 * Get CONN_ID from file descriptor associated to a subprocess structure.
2306 * @param fd File descriptor.
2307 * @returns CONN_ID or NONE (-1).
2310 Conn_GetFromProc(int fd)
2315 for (i = 0; i < Pool_Size; i++) {
2316 if ((My_Connections[i].sock != NONE)
2317 && (Proc_GetPipeFd(&My_Connections[i].proc_stat) == fd))
2321 } /* Conn_GetFromProc */
2327 Conn_GetAuthPing(CONN_ID Idx)
2329 assert (Idx != NONE);
2330 return My_Connections[Idx].auth_ping;
2331 } /* Conn_GetAuthPing */
2334 Conn_SetAuthPing(CONN_ID Idx, long ID)
2336 assert (Idx != NONE);
2337 My_Connections[Idx].auth_ping = ID;
2338 } /* Conn_SetAuthPing */
2346 * Get information about used SSL chiper.
2348 * @param Idx Connection index number.
2349 * @param buf Buffer for returned information text.
2350 * @param len Size of return buffer "buf".
2351 * @returns true on success, false otherwise.
2354 Conn_GetCipherInfo(CONN_ID Idx, char *buf, size_t len)
2358 assert(Idx < (int) array_length(&My_ConnArray, sizeof(CONNECTION)));
2359 return ConnSSL_GetCipherInfo(&My_Connections[Idx], buf, len);
2364 * Check if a connection is SSL-enabled or not.
2366 * @param Idx Connection index number.
2367 * @return true if connection is SSL-enabled, false otherwise.
2370 Conn_UsesSSL(CONN_ID Idx)
2374 assert(Idx < (int) array_length(&My_ConnArray, sizeof(CONNECTION)));
2375 return Conn_OPTION_ISSET(&My_Connections[Idx], CONN_SSL);
2384 * Dump internal state of the "connection module".
2387 Conn_DebugDump(void)
2391 Log(LOG_DEBUG, "Connection status:");
2392 for (i = 0; i < Pool_Size; i++) {
2393 if (My_Connections[i].sock == NONE)
2396 " - %d: host=%s, lastdata=%ld, lastping=%ld, delaytime=%ld, flag=%d, options=%d, bps=%d, client=%s",
2397 My_Connections[i].sock, My_Connections[i].host,
2398 My_Connections[i].lastdata, My_Connections[i].lastping,
2399 My_Connections[i].delaytime, My_Connections[i].flag,
2400 My_Connections[i].options, My_Connections[i].bps,
2401 My_Connections[i].client ? Client_ID(My_Connections[i].client) : "-");
2403 } /* Conn_DumpClients */