2 * ngIRCd -- The Next Generation IRC Daemon
3 * Copyright (c)2001-2012 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_MIN 10
86 #define MAX_COMMANDS_SERVICE 10
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 * Initialize 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 /* Is the socket still open? A previous call to Conn_Write()
940 * may have closed the connection due to a fatal error.
941 * In this case it is sufficient to return an error, as well. */
942 if (My_Connections[Idx].sock <= NONE) {
943 LogDebug("Skipped write on closed socket (connection %d).", Idx);
947 /* Make sure that there still exists a CLIENT structure associated
948 * with this connection and check if this is a server or not: */
949 c = Conn_GetClient(Idx);
951 /* Servers do get special write buffer limits, so they can
952 * generate all the messages that are required while peering. */
953 if (Client_Type(c) == CLIENT_SERVER)
954 writebuf_limit = WRITEBUFFER_SLINK_LEN;
956 LogDebug("Write on socket without client (connection %d)!?", Idx);
959 if ( Conn_OPTION_ISSET( &My_Connections[Idx], CONN_ZIP )) {
961 * Zip_Buffer() does all the dirty work for us: it flushes
962 * the (pre-)compression buffers if required and handles
963 * all error conditions. */
964 if (!Zip_Buffer(Idx, Data, Len))
970 /* Uncompressed link:
971 * Check if outbound buffer has enough space for the data. */
972 if (array_bytes(&My_Connections[Idx].wbuf) + Len >=
973 WRITEBUFFER_FLUSH_LEN) {
974 /* Buffer is full, flush it. Handle_Write deals with
975 * low-level errors, if any. */
976 if (!Handle_Write(Idx))
980 /* When the write buffer is still too big after flushing it,
981 * the connection will be killed. */
982 if (array_bytes(&My_Connections[Idx].wbuf) + Len >=
985 "Write buffer space exhausted (connection %d, limit is %lu bytes, %lu bytes new, %lu bytes pending)",
986 Idx, writebuf_limit, Len,
987 (unsigned long)array_bytes(&My_Connections[Idx].wbuf));
988 Conn_Close(Idx, "Write buffer space exhausted", NULL, false);
992 /* Copy data to write buffer */
993 if (!array_catb(&My_Connections[Idx].wbuf, Data, Len))
996 My_Connections[Idx].bytes_out += Len;
999 /* Adjust global write counter */
1007 * Shut down a connection.
1009 * @param Idx Connection index.
1010 * @param LogMsg Message to write to the log or NULL. If no LogMsg
1011 * is given, the FwdMsg is logged.
1012 * @param FwdMsg Message to forward to remote servers.
1013 * @param InformClient If true, inform the client on the connection which is
1014 * to be shut down of the reason (FwdMsg) and send
1015 * connection statistics before disconnecting it.
1018 Conn_Close( CONN_ID Idx, const char *LogMsg, const char *FwdMsg, bool InformClient )
1020 /* Close connection. Open pipes of asynchronous resolver
1021 * sub-processes are closed down. */
1027 double in_z_k, out_z_k;
1031 assert( Idx > NONE );
1033 /* Is this link already shutting down? */
1034 if( Conn_OPTION_ISSET( &My_Connections[Idx], CONN_ISCLOSING )) {
1035 /* Conn_Close() has been called recursively for this link;
1036 * probabe reason: Handle_Write() failed -- see below. */
1037 LogDebug("Recursive request to close connection: %d", Idx );
1041 assert( My_Connections[Idx].sock > NONE );
1043 /* Mark link as "closing" */
1044 Conn_OPTION_ADD( &My_Connections[Idx], CONN_ISCLOSING );
1046 port = ng_ipaddr_getport(&My_Connections[Idx].addr);
1047 Log(LOG_INFO, "Shutting down connection %d (%s) with %s:%d ...", Idx,
1048 LogMsg ? LogMsg : FwdMsg, My_Connections[Idx].host, port);
1050 /* Search client, if any */
1051 c = Conn_GetClient( Idx );
1053 /* Should the client be informed? */
1056 /* Send statistics to client if registered as user: */
1057 if ((c != NULL) && (Client_Type(c) == CLIENT_USER)) {
1059 ":%s NOTICE %s :%sConnection statistics: client %.1f kb, server %.1f kb.",
1060 Client_ID(Client_ThisServer()), Client_ID(c),
1062 (double)My_Connections[Idx].bytes_in / 1024,
1063 (double)My_Connections[Idx].bytes_out / 1024);
1066 /* Send ERROR to client (see RFC 2812, section 3.1.7) */
1068 Conn_WriteStr(Idx, "ERROR :%s", FwdMsg);
1070 Conn_WriteStr(Idx, "ERROR :Closing connection");
1073 /* Try to write out the write buffer. Note: Handle_Write() eventually
1074 * removes the CLIENT structure associated with this connection if an
1075 * error occurs! So we have to re-check if there is still an valid
1076 * CLIENT structure after calling Handle_Write() ...*/
1077 (void)Handle_Write( Idx );
1079 /* Search client, if any (re-check!) */
1080 c = Conn_GetClient( Idx );
1082 if ( Conn_OPTION_ISSET( &My_Connections[Idx], CONN_SSL )) {
1083 Log(LOG_INFO, "SSL connection %d shutting down ...", Idx);
1084 ConnSSL_Free(&My_Connections[Idx]);
1087 /* Shut down socket */
1088 if (! io_close(My_Connections[Idx].sock)) {
1089 /* Oops, we can't close the socket!? This is ... ugly! */
1091 "Error closing connection %d (socket %d) with %s:%d - %s! (ignored)",
1092 Idx, My_Connections[Idx].sock, My_Connections[Idx].host,
1093 port, strerror(errno));
1096 /* Mark socket as invalid: */
1097 My_Connections[Idx].sock = NONE;
1099 /* If there is still a client, unregister it now */
1101 Client_Destroy(c, LogMsg, FwdMsg, true);
1103 /* Calculate statistics and log information */
1104 in_k = (double)My_Connections[Idx].bytes_in / 1024;
1105 out_k = (double)My_Connections[Idx].bytes_out / 1024;
1107 if (Conn_OPTION_ISSET( &My_Connections[Idx], CONN_ZIP)) {
1108 in_z_k = (double)My_Connections[Idx].zip.bytes_in / 1024;
1109 out_z_k = (double)My_Connections[Idx].zip.bytes_out / 1024;
1110 /* Make sure that no division by zero can occur during
1111 * the calculation of in_p and out_p: in_z_k and out_z_k
1112 * are non-zero, that's guaranteed by the protocol until
1113 * compression can be enabled. */
1118 in_p = (int)(( in_k * 100 ) / in_z_k );
1119 out_p = (int)(( out_k * 100 ) / out_z_k );
1121 "Connection %d with %s:%d closed (in: %.1fk/%.1fk/%d%%, out: %.1fk/%.1fk/%d%%).",
1122 Idx, My_Connections[Idx].host, port,
1123 in_k, in_z_k, in_p, out_k, out_z_k, out_p);
1129 "Connection %d with %s:%d closed (in: %.1fk, out: %.1fk).",
1130 Idx, My_Connections[Idx].host, port,
1134 /* Servers: Modify time of next connect attempt? */
1135 Conf_UnsetServer( Idx );
1138 /* Clean up zlib, if link was compressed */
1139 if ( Conn_OPTION_ISSET( &My_Connections[Idx], CONN_ZIP )) {
1140 inflateEnd( &My_Connections[Idx].zip.in );
1141 deflateEnd( &My_Connections[Idx].zip.out );
1142 array_free(&My_Connections[Idx].zip.rbuf);
1143 array_free(&My_Connections[Idx].zip.wbuf);
1147 array_free(&My_Connections[Idx].rbuf);
1148 array_free(&My_Connections[Idx].wbuf);
1150 /* Clean up connection structure (=free it) */
1151 Init_Conn_Struct( Idx );
1153 assert(NumConnections > 0);
1156 LogDebug("Shutdown of connection %d completed, %ld connection%s left.",
1157 Idx, NumConnections, NumConnections != 1 ? "s" : "");
1162 * Get current number of connections.
1164 * @returns Number of current connections.
1169 return NumConnections;
1174 * Get number of maximum simultaneous connections.
1176 * @returns Number of maximum simultaneous connections.
1181 return NumConnectionsMax;
1182 } /* Conn_CountMax */
1186 * Get number of connections accepted since the daemon startet.
1188 * @returns Number of connections accepted.
1191 Conn_CountAccepted(void)
1193 return NumConnectionsAccepted;
1194 } /* Conn_CountAccepted */
1198 * Synchronize established connections and configured server structures
1199 * after a configuration update and store the correct connection IDs, if any.
1202 Conn_SyncServerStruct(void)
1208 for (i = 0; i < Pool_Size; i++) {
1209 if (My_Connections[i].sock == NONE)
1213 client = Conn_GetClient(i);
1214 if (!client || Client_Type(client) != CLIENT_SERVER)
1217 for (c = 0; c < MAX_SERVERS; c++) {
1218 /* Configured server? */
1219 if (!Conf_Server[c].host[0])
1222 if (strcasecmp(Conf_Server[c].name, Client_ID(client)) == 0)
1223 Conf_Server[c].conn_id = i;
1226 } /* SyncServerStruct */
1230 * Get IP address string of a connection.
1232 * @param Idx Connection index.
1233 * @return Pointer to a global buffer containing the IP address as string.
1236 Conn_GetIPAInfo(CONN_ID Idx)
1239 return ng_ipaddr_tostr(&My_Connections[Idx].addr);
1244 * Send out data of write buffer; connect new sockets.
1246 * @param Idx Connection index.
1247 * @returns true on success, false otherwise.
1250 Handle_Write( CONN_ID Idx )
1255 assert( Idx > NONE );
1256 if ( My_Connections[Idx].sock < 0 ) {
1257 LogDebug("Handle_Write() on closed socket, connection %d", Idx);
1260 assert( My_Connections[Idx].sock > NONE );
1262 wdatalen = array_bytes(&My_Connections[Idx].wbuf );
1265 if (wdatalen == 0) {
1266 /* Write buffer is empty, so we try to flush the compression
1267 * buffer and get some data to work with from there :-) */
1268 if (!Zip_Flush(Idx))
1271 /* Now the write buffer most probably has changed: */
1272 wdatalen = array_bytes(&My_Connections[Idx].wbuf);
1276 if (wdatalen == 0) {
1277 /* Still no data, fine. */
1278 io_event_del(My_Connections[Idx].sock, IO_WANTWRITE );
1284 ("Handle_Write() called for connection %d, %ld bytes pending ...",
1289 if ( Conn_OPTION_ISSET( &My_Connections[Idx], CONN_SSL )) {
1290 len = ConnSSL_Write(&My_Connections[Idx], array_start(&My_Connections[Idx].wbuf), wdatalen);
1294 len = write(My_Connections[Idx].sock,
1295 array_start(&My_Connections[Idx].wbuf), wdatalen );
1298 if (errno == EAGAIN || errno == EINTR)
1301 Log(LOG_ERR, "Write error on connection %d (socket %d): %s!",
1302 Idx, My_Connections[Idx].sock, strerror(errno));
1303 Conn_Close(Idx, "Write error!", NULL, false);
1307 /* move any data not yet written to beginning */
1308 array_moveleft(&My_Connections[Idx].wbuf, 1, (size_t)len);
1311 } /* Handle_Write */
1315 * Count established connections to a specific IP address.
1317 * @returns Number of established connections.
1320 Count_Connections(ng_ipaddr_t *a)
1325 for (i = 0; i < Pool_Size; i++) {
1326 if (My_Connections[i].sock <= NONE)
1328 if (ng_ipaddr_ipequal(&My_Connections[i].addr, a))
1332 } /* Count_Connections */
1336 * Initialize new client connection on a listening socket.
1338 * @param Sock Listening socket descriptor.
1339 * @returns Accepted socket descriptor or -1 on error.
1342 New_Connection(int Sock)
1345 struct request_info req;
1347 ng_ipaddr_t new_addr;
1348 char ip_str[NG_INET_ADDRSTRLEN];
1349 int new_sock, new_sock_len, identsock;
1353 assert(Sock > NONE);
1355 LogDebug("Accepting new connection on socket %d ...", Sock);
1357 new_sock_len = (int)sizeof(new_addr);
1358 new_sock = accept(Sock, (struct sockaddr *)&new_addr,
1359 (socklen_t *)&new_sock_len);
1361 Log(LOG_CRIT, "Can't accept connection: %s!", strerror(errno));
1364 NumConnectionsAccepted++;
1366 if (!ng_ipaddr_tostr_r(&new_addr, ip_str)) {
1367 Log(LOG_CRIT, "fd %d: Can't convert IP address!", new_sock);
1368 Simple_Message(new_sock, "ERROR :Internal Server Error");
1374 /* Validate socket using TCP Wrappers */
1375 request_init(&req, RQ_DAEMON, PACKAGE_NAME, RQ_FILE, new_sock,
1376 RQ_CLIENT_SIN, &new_addr, NULL);
1378 if (!hosts_access(&req)) {
1380 "Refused connection from %s (by TCP Wrappers)!", ip_str);
1381 Simple_Message(new_sock, "ERROR :Connection refused");
1387 if (!Init_Socket(new_sock))
1390 /* Check global connection limit */
1391 if ((Conf_MaxConnections > 0) &&
1392 (NumConnections >= (size_t) Conf_MaxConnections)) {
1393 Log(LOG_ALERT, "Can't accept connection: limit (%d) reached!",
1394 Conf_MaxConnections);
1395 Simple_Message(new_sock, "ERROR :Connection limit reached");
1400 /* Check IP-based connection limit */
1401 cnt = Count_Connections(&new_addr);
1402 if ((Conf_MaxConnectionsIP > 0) && (cnt >= Conf_MaxConnectionsIP)) {
1403 /* Access denied, too many connections from this IP address! */
1405 "Refused connection from %s: too may connections (%ld) from this IP address!",
1407 Simple_Message(new_sock,
1408 "ERROR :Connection refused, too many connections from your IP address");
1413 if (new_sock >= Pool_Size) {
1414 if (!array_alloc(&My_ConnArray, sizeof(CONNECTION),
1415 (size_t) new_sock)) {
1417 "Can't allocate memory! [New_Connection]");
1418 Simple_Message(new_sock, "ERROR: Internal error");
1422 LogDebug("Bumped connection pool to %ld items (internal: %ld items, %ld bytes)",
1423 new_sock, array_length(&My_ConnArray,
1424 sizeof(CONNECTION)), array_bytes(&My_ConnArray));
1426 /* Adjust pointer to new block */
1427 My_Connections = array_start(&My_ConnArray);
1428 while (Pool_Size <= new_sock)
1429 Init_Conn_Struct(Pool_Size++);
1432 /* register callback */
1433 if (!io_event_create(new_sock, IO_WANTREAD, cb_clientserver)) {
1435 "Can't accept connection: io_event_create failed!");
1436 Simple_Message(new_sock, "ERROR :Internal error");
1441 c = Client_NewLocal(new_sock, NULL, CLIENT_UNKNOWN, false);
1444 "Can't accept connection: can't create client structure!");
1445 Simple_Message(new_sock, "ERROR :Internal error");
1450 Init_Conn_Struct(new_sock);
1451 My_Connections[new_sock].sock = new_sock;
1452 My_Connections[new_sock].addr = new_addr;
1453 My_Connections[new_sock].client = c;
1455 /* Set initial hostname to IP address. This becomes overwritten when
1456 * the DNS lookup is enabled and succeeds, but is used otherwise. */
1457 if (ng_ipaddr_af(&new_addr) != AF_INET)
1458 snprintf(My_Connections[new_sock].host,
1459 sizeof(My_Connections[new_sock].host), "[%s]", ip_str);
1461 strlcpy(My_Connections[new_sock].host, ip_str,
1462 sizeof(My_Connections[new_sock].host));
1464 Client_SetHostname(c, My_Connections[new_sock].host);
1466 Log(LOG_INFO, "Accepted connection %d from %s:%d on socket %d.",
1467 new_sock, My_Connections[new_sock].host,
1468 ng_ipaddr_getport(&new_addr), Sock);
1470 identsock = new_sock;
1476 if (Conf_NoticeAuth) {
1479 (void)Conn_WriteStr(new_sock,
1480 "NOTICE AUTH :*** Looking up your hostname and checking ident");
1483 (void)Conn_WriteStr(new_sock,
1484 "NOTICE AUTH :*** Looking up your hostname");
1486 Resolve_Addr(&My_Connections[new_sock].proc_stat, &new_addr,
1487 identsock, cb_Read_Resolver_Result);
1490 Account_Connection();
1492 } /* New_Connection */
1496 * Update global connection counters.
1499 Account_Connection(void)
1502 if (NumConnections > NumConnectionsMax)
1503 NumConnectionsMax = NumConnections;
1504 LogDebug("Total number of connections now %lu (max %lu).",
1505 NumConnections, NumConnectionsMax);
1506 } /* Account_Connection */
1510 * Translate socket handle into connection index.
1512 * @param Sock Socket handle.
1513 * @returns Connecion index or NONE, if no connection could be found.
1516 Socket2Index( int Sock )
1518 assert( Sock >= 0 );
1520 if( Sock >= Pool_Size || My_Connections[Sock].sock != Sock ) {
1521 /* the Connection was already closed again, likely due to
1523 LogDebug("Socket2Index: can't get connection for socket %d!", Sock);
1527 } /* Socket2Index */
1531 * Read data from the network to the read buffer. If an error occures,
1532 * the socket of this connection will be shut down.
1534 * @param Idx Connection index.
1537 Read_Request( CONN_ID Idx )
1540 static const unsigned int maxbps = COMMAND_LEN / 2;
1541 char readbuf[READBUFFER_LEN];
1544 assert( Idx > NONE );
1545 assert( My_Connections[Idx].sock > NONE );
1548 if ((array_bytes(&My_Connections[Idx].rbuf) >= READBUFFER_LEN) ||
1549 (array_bytes(&My_Connections[Idx].zip.rbuf) >= READBUFFER_LEN))
1551 if (array_bytes(&My_Connections[Idx].rbuf) >= READBUFFER_LEN)
1554 /* Read buffer is full */
1556 "Receive buffer space exhausted (connection %d): %d bytes",
1557 Idx, array_bytes(&My_Connections[Idx].rbuf));
1558 Conn_Close(Idx, "Receive buffer space exhausted", NULL, false);
1563 if (Conn_OPTION_ISSET(&My_Connections[Idx], CONN_SSL))
1564 len = ConnSSL_Read( &My_Connections[Idx], readbuf, sizeof(readbuf));
1567 len = read(My_Connections[Idx].sock, readbuf, sizeof(readbuf));
1569 Log(LOG_INFO, "%s:%u (%s) is closing the connection ...",
1570 My_Connections[Idx].host,
1571 (unsigned int) ng_ipaddr_getport(&My_Connections[Idx].addr),
1572 ng_ipaddr_tostr(&My_Connections[Idx].addr));
1574 "Socket closed!", "Client closed connection",
1580 if( errno == EAGAIN ) return;
1581 Log(LOG_ERR, "Read error on connection %d (socket %d): %s!",
1582 Idx, My_Connections[Idx].sock, strerror(errno));
1583 Conn_Close(Idx, "Read error!", "Client closed connection",
1588 if (Conn_OPTION_ISSET(&My_Connections[Idx], CONN_ZIP)) {
1589 if (!array_catb(&My_Connections[Idx].zip.rbuf, readbuf,
1592 "Could not append received data to zip input buffer (connection %d): %d bytes!",
1594 Conn_Close(Idx, "Receive buffer space exhausted", NULL,
1601 if (!array_catb( &My_Connections[Idx].rbuf, readbuf, len)) {
1603 "Could not append received data to input buffer (connection %d): %d bytes!",
1605 Conn_Close(Idx, "Receive buffer space exhausted", NULL, false );
1609 /* Update connection statistics */
1610 My_Connections[Idx].bytes_in += len;
1611 My_Connections[Idx].bps += Handle_Buffer(Idx);
1613 /* Make sure that there is still a valid client registered */
1614 c = Conn_GetClient(Idx);
1618 /* Update timestamp of last data received if this connection is
1619 * registered as a user, server or service connection. Don't update
1620 * otherwise, so users have at least Conf_PongTimeout seconds time to
1621 * register with the IRC server -- see Check_Connections().
1622 * Update "lastping", too, if time shifted backwards ... */
1623 if (Client_Type(c) == CLIENT_USER
1624 || Client_Type(c) == CLIENT_SERVER
1625 || Client_Type(c) == CLIENT_SERVICE) {
1627 if (My_Connections[Idx].lastdata != t)
1628 My_Connections[Idx].bps = 0;
1630 My_Connections[Idx].lastdata = t;
1631 if (My_Connections[Idx].lastping > t)
1632 My_Connections[Idx].lastping = t;
1635 /* Look at the data in the (read-) buffer of this connection */
1636 if (Client_Type(c) != CLIENT_SERVER
1637 && Client_Type(c) != CLIENT_UNKNOWNSERVER
1638 && Client_Type(c) != CLIENT_SERVICE
1639 && My_Connections[Idx].bps >= maxbps) {
1640 LogDebug("Throttling connection %d: BPS exceeded! (%u >= %u)",
1641 Idx, My_Connections[Idx].bps, maxbps);
1642 Conn_SetPenalty(Idx, 1);
1644 } /* Read_Request */
1648 * Handle all data in the connection read-buffer.
1650 * Data is processed until no complete command is left in the read buffer,
1651 * or MAX_COMMANDS[_SERVER|_SERVICE] commands were processed.
1652 * When a fatal error occurs, the connection is shut down.
1654 * @param Idx Index of the connection.
1655 * @returns Number of bytes processed.
1658 Handle_Buffer(CONN_ID Idx)
1661 char *ptr1, *ptr2, *first_eol;
1669 unsigned int i, maxcmd = MAX_COMMANDS, len_processed = 0;
1672 c = Conn_GetClient(Idx);
1673 starttime = time(NULL);
1677 /* Servers get special command limits that depend on the user count */
1678 switch (Client_Type(c)) {
1680 maxcmd = (int)(Client_UserCount() / 5)
1681 + MAX_COMMANDS_SERVER_MIN;
1682 /* Allow servers to handle even more commands while peering
1683 * to speed up server login and network synchronisation. */
1684 if (Conn_LastPing(Idx) == 0)
1687 case CLIENT_SERVICE:
1688 maxcmd = MAX_COMMANDS_SERVICE; break;
1691 for (i=0; i < maxcmd; i++) {
1693 if (My_Connections[Idx].delaytime > starttime)
1696 /* Unpack compressed data, if compression is in use */
1697 if (Conn_OPTION_ISSET(&My_Connections[Idx], CONN_ZIP)) {
1698 /* When unzipping fails, Unzip_Buffer() shuts
1699 * down the connection itself */
1700 if (!Unzip_Buffer(Idx))
1705 if (0 == array_bytes(&My_Connections[Idx].rbuf))
1708 /* Make sure that the buffer is NULL terminated */
1709 if (!array_cat0_temporary(&My_Connections[Idx].rbuf)) {
1710 Conn_Close(Idx, NULL,
1711 "Can't allocate memory [Handle_Buffer]",
1716 /* RFC 2812, section "2.3 Messages", 5th paragraph:
1717 * "IRC messages are always lines of characters terminated
1718 * with a CR-LF (Carriage Return - Line Feed) pair [...]". */
1720 ptr = strstr(array_start(&My_Connections[Idx].rbuf), "\r\n");
1723 /* Check for non-RFC-compliant request (only CR or LF)?
1724 * Unfortunately, there are quite a few clients out there
1725 * that do this -- e. g. mIRC, BitchX, and Trillian :-( */
1726 ptr1 = strchr(array_start(&My_Connections[Idx].rbuf), '\r');
1727 ptr2 = strchr(array_start(&My_Connections[Idx].rbuf), '\n');
1729 /* Check if there is a single CR or LF _before_ the
1730 * corerct CR+LF line terminator: */
1731 first_eol = ptr1 < ptr2 ? ptr1 : ptr2;
1732 if (first_eol < ptr) {
1733 /* Single CR or LF before CR+LF found */
1737 } else if (ptr1 || ptr2) {
1738 /* No CR+LF terminated command found, but single
1739 * CR or LF found ... */
1741 ptr = ptr1 < ptr2 ? ptr1 : ptr2;
1743 ptr = ptr1 ? ptr1 : ptr2;
1751 /* Complete (=line terminated) request found, handle it! */
1754 len = ptr - (char *)array_start(&My_Connections[Idx].rbuf) + delta;
1756 if (len > (COMMAND_LEN - 1)) {
1757 /* Request must not exceed 512 chars (incl. CR+LF!),
1758 * see RFC 2812. Disconnect Client if this happens. */
1760 "Request too long (connection %d): %d bytes (max. %d expected)!",
1761 Idx, array_bytes(&My_Connections[Idx].rbuf),
1763 Conn_Close(Idx, NULL, "Request too long", true);
1767 len_processed += (unsigned int)len;
1769 /* Request is empty (only '\r\n', '\r' or '\n');
1770 * delta is 2 ('\r\n') or 1 ('\r' or '\n'), see above */
1771 array_moveleft(&My_Connections[Idx].rbuf, 1, len);
1775 /* remember if stream is already compressed */
1776 old_z = My_Connections[Idx].options & CONN_ZIP;
1779 My_Connections[Idx].msg_in++;
1781 (Idx, (char *)array_start(&My_Connections[Idx].rbuf)))
1782 return 0; /* error -> connection has been closed */
1784 array_moveleft(&My_Connections[Idx].rbuf, 1, len);
1786 LogDebug("Connection %d: %d bytes left in read buffer.",
1787 Idx, array_bytes(&My_Connections[Idx].rbuf));
1790 if ((!old_z) && (My_Connections[Idx].options & CONN_ZIP) &&
1791 (array_bytes(&My_Connections[Idx].rbuf) > 0)) {
1792 /* The last command activated socket compression.
1793 * Data that was read after that needs to be copied
1794 * to the unzip buffer for decompression: */
1796 (&My_Connections[Idx].zip.rbuf,
1797 &My_Connections[Idx].rbuf)) {
1798 Conn_Close(Idx, NULL,
1799 "Can't allocate memory [Handle_Buffer]",
1804 array_trunc(&My_Connections[Idx].rbuf);
1806 ("Moved already received data (%u bytes) to uncompression buffer.",
1807 array_bytes(&My_Connections[Idx].zip.rbuf));
1811 return len_processed;
1812 } /* Handle_Buffer */
1816 * Check whether established connections are still alive or not.
1817 * If not, play PING-PONG first; and if that doesn't help either,
1818 * disconnect the respective peer.
1821 Check_Connections(void)
1827 for (i = 0; i < Pool_Size; i++) {
1828 if (My_Connections[i].sock < 0)
1831 c = Conn_GetClient(i);
1832 if (c && ((Client_Type(c) == CLIENT_USER)
1833 || (Client_Type(c) == CLIENT_SERVER)
1834 || (Client_Type(c) == CLIENT_SERVICE))) {
1835 /* connected User, Server or Service */
1836 if (My_Connections[i].lastping >
1837 My_Connections[i].lastdata) {
1838 /* We already sent a ping */
1839 if (My_Connections[i].lastping <
1840 time(NULL) - Conf_PongTimeout) {
1843 ("Connection %d: Ping timeout: %d seconds.",
1844 i, Conf_PongTimeout);
1845 snprintf(msg, sizeof(msg), "Ping timeout: %d seconds", Conf_PongTimeout);
1846 Conn_Close(i, NULL, msg, true);
1848 } else if (My_Connections[i].lastdata <
1849 time(NULL) - Conf_PingTimeout) {
1850 /* We need to send a PING ... */
1851 LogDebug("Connection %d: sending PING ...", i);
1853 Conn_WriteStr(i, "PING :%s",
1854 Client_ID(Client_ThisServer()));
1857 /* The connection is not fully established yet, so
1858 * we don't do the PING-PONG game here but instead
1859 * disconnect the client after "a short time" if it's
1860 * still not registered. */
1862 if (My_Connections[i].lastdata <
1863 time(NULL) - Conf_PongTimeout) {
1865 ("Unregistered connection %d timed out ...",
1867 Conn_Close(i, NULL, "Timeout", false);
1871 } /* Check_Connections */
1875 * Check if further server links should be established.
1883 time_now = time(NULL);
1885 /* Check all configured servers */
1886 for (i = 0; i < MAX_SERVERS; i++) {
1887 if (Conf_Server[i].conn_id != NONE)
1888 continue; /* Already establishing or connected */
1889 if (!Conf_Server[i].host[0] || !Conf_Server[i].port > 0)
1890 continue; /* No host and/or port configured */
1891 if (Conf_Server[i].flags & CONF_SFLAG_DISABLED)
1892 continue; /* Disabled configuration entry */
1893 if (Conf_Server[i].lasttry > (time_now - Conf_ConnectRetry))
1894 continue; /* We have to wait a little bit ... */
1896 /* Is there already a connection in this group? */
1897 if (Conf_Server[i].group > NONE) {
1898 for (n = 0; n < MAX_SERVERS; n++) {
1901 if ((Conf_Server[n].conn_id != NONE) &&
1902 (Conf_Server[n].group == Conf_Server[i].group))
1905 if (n < MAX_SERVERS)
1909 /* Okay, try to connect now */
1911 "Preparing to establish a new server link for \"%s\" ...",
1912 Conf_Server[i].name);
1913 Conf_Server[i].lasttry = time_now;
1914 Conf_Server[i].conn_id = SERVER_WAIT;
1915 assert(Proc_GetPipeFd(&Conf_Server[i].res_stat) < 0);
1916 Resolve_Name(&Conf_Server[i].res_stat, Conf_Server[i].host,
1917 cb_Connect_to_Server);
1919 } /* Check_Servers */
1923 * Establish a new outgoing server connection.
1925 * @param Server Configuration index of the server.
1926 * @param dest Destination IP address to connect to.
1929 New_Server( int Server , ng_ipaddr_t *dest)
1931 /* Establish new server link */
1932 char ip_str[NG_INET_ADDRSTRLEN];
1933 int af_dest, res, new_sock;
1936 assert( Server > NONE );
1938 /* Make sure that the remote server hasn't re-linked to this server
1939 * asynchronously on its own */
1940 if (Conf_Server[Server].conn_id > NONE) {
1942 "Connection to \"%s\" meanwhile re-established, aborting preparation.");
1946 if (!ng_ipaddr_tostr_r(dest, ip_str)) {
1947 Log(LOG_WARNING, "New_Server: Could not convert IP to string");
1951 af_dest = ng_ipaddr_af(dest);
1952 new_sock = socket(af_dest, SOCK_STREAM, 0);
1955 "Establishing connection for \"%s\" to \"%s:%d\" (%s), socket %d ...",
1956 Conf_Server[Server].name, Conf_Server[Server].host,
1957 Conf_Server[Server].port, ip_str, new_sock);
1960 Log(LOG_CRIT, "Can't create socket (af %d): %s!",
1961 af_dest, strerror(errno));
1965 if (!Init_Socket(new_sock))
1968 /* is a bind address configured? */
1969 res = ng_ipaddr_af(&Conf_Server[Server].bind_addr);
1970 /* if yes, bind now. If it fails, warn and let connect() pick a source address */
1971 if (res && bind(new_sock, (struct sockaddr *) &Conf_Server[Server].bind_addr,
1972 ng_ipaddr_salen(&Conf_Server[Server].bind_addr)))
1974 ng_ipaddr_tostr_r(&Conf_Server[Server].bind_addr, ip_str);
1975 Log(LOG_WARNING, "Can't bind socket to %s: %s!", ip_str, strerror(errno));
1977 ng_ipaddr_setport(dest, Conf_Server[Server].port);
1978 res = connect(new_sock, (struct sockaddr *) dest, ng_ipaddr_salen(dest));
1979 if(( res != 0 ) && ( errno != EINPROGRESS )) {
1980 Log( LOG_CRIT, "Can't connect socket: %s!", strerror( errno ));
1985 if (!array_alloc(&My_ConnArray, sizeof(CONNECTION), (size_t)new_sock)) {
1987 "Cannot allocate memory for server connection (socket %d)",
1993 if (!io_event_create( new_sock, IO_WANTWRITE, cb_connserver)) {
1994 Log(LOG_ALERT, "io_event_create(): could not add fd %d", strerror(errno));
1999 My_Connections = array_start(&My_ConnArray);
2001 assert(My_Connections[new_sock].sock <= 0);
2003 Init_Conn_Struct(new_sock);
2005 ng_ipaddr_tostr_r(dest, ip_str);
2006 c = Client_NewLocal(new_sock, ip_str, CLIENT_UNKNOWNSERVER, false);
2008 Log( LOG_ALERT, "Can't establish connection: can't create client structure!" );
2013 /* Conn_Close() decrements this counter again */
2014 Account_Connection();
2015 Client_SetIntroducer( c, c );
2016 Client_SetToken( c, TOKEN_OUTBOUND );
2018 /* Register connection */
2019 Conf_SetServer(Server, new_sock);
2020 My_Connections[new_sock].sock = new_sock;
2021 My_Connections[new_sock].addr = *dest;
2022 My_Connections[new_sock].client = c;
2023 strlcpy( My_Connections[new_sock].host, Conf_Server[Server].host,
2024 sizeof(My_Connections[new_sock].host ));
2027 if (Conf_Server[Server].SSLConnect && !ConnSSL_PrepareConnect( &My_Connections[new_sock],
2028 &Conf_Server[Server] ))
2030 Log(LOG_ALERT, "Could not initialize SSL for outgoing connection");
2031 Conn_Close( new_sock, "Could not initialize SSL for outgoing connection", NULL, false );
2032 Init_Conn_Struct( new_sock );
2033 Conf_Server[Server].conn_id = NONE;
2037 LogDebug("Registered new connection %d on socket %d (%ld in total).",
2038 new_sock, My_Connections[new_sock].sock, NumConnections);
2039 Conn_OPTION_ADD( &My_Connections[new_sock], CONN_ISCONNECTING );
2044 * Initialize connection structure.
2046 * @param Idx Connection index.
2049 Init_Conn_Struct(CONN_ID Idx)
2051 time_t now = time(NULL);
2053 memset(&My_Connections[Idx], 0, sizeof(CONNECTION));
2054 My_Connections[Idx].sock = -1;
2055 My_Connections[Idx].signon = now;
2056 My_Connections[Idx].lastdata = now;
2057 My_Connections[Idx].lastprivmsg = now;
2058 Proc_InitStruct(&My_Connections[Idx].proc_stat);
2059 } /* Init_Conn_Struct */
2063 * Initialize options of a new socket.
2065 * For example, we try to set socket options SO_REUSEADDR and IPTOS_LOWDELAY.
2066 * The socket is automatically closed if a fatal error is encountered.
2068 * @param Sock Socket handle.
2069 * @returns false if socket was closed due to fatal error.
2072 Init_Socket( int Sock )
2076 if (!io_setnonblock(Sock)) {
2077 Log( LOG_CRIT, "Can't enable non-blocking mode for socket: %s!", strerror( errno ));
2082 /* Don't block this port after socket shutdown */
2084 if( setsockopt( Sock, SOL_SOCKET, SO_REUSEADDR, &value, (socklen_t)sizeof( value )) != 0 )
2086 Log( LOG_ERR, "Can't set socket option SO_REUSEADDR: %s!", strerror( errno ));
2087 /* ignore this error */
2090 /* Set type of service (TOS) */
2091 #if defined(IPPROTO_IP) && defined(IPTOS_LOWDELAY)
2092 value = IPTOS_LOWDELAY;
2093 if (setsockopt(Sock, IPPROTO_IP, IP_TOS, &value,
2094 (socklen_t) sizeof(value))) {
2095 LogDebug("Can't set socket option IP_TOS: %s!",
2097 /* ignore this error */
2099 LogDebug("IP_TOS on socket %d has been set to IPTOS_LOWDELAY.",
2108 * Read results of a resolver sub-process and try to initiate a new server
2111 * @param fd File descriptor of the pipe to the sub-process.
2112 * @param events (ignored IO specification)
2115 cb_Connect_to_Server(int fd, UNUSED short events)
2117 /* Read result of resolver sub-process from pipe and start connection */
2120 ng_ipaddr_t dest_addrs[4]; /* we can handle at most 3; but we read up to
2121 four so we can log the 'more than we can handle'
2122 condition. First result is tried immediately, rest
2123 is saved for later if needed. */
2125 LogDebug("Resolver: Got forward lookup callback on fd %d, events %d", fd, events);
2127 for (i=0; i < MAX_SERVERS; i++) {
2128 if (Proc_GetPipeFd(&Conf_Server[i].res_stat) == fd )
2132 if( i >= MAX_SERVERS) {
2133 /* Ops, no matching server found?! */
2135 LogDebug("Resolver: Got Forward Lookup callback for unknown server!?");
2139 /* Read result from pipe */
2140 len = Proc_Read(&Conf_Server[i].res_stat, dest_addrs, sizeof(dest_addrs));
2141 Proc_Close(&Conf_Server[i].res_stat);
2143 /* Error resolving hostname: reset server structure */
2144 Conf_Server[i].conn_id = NONE;
2148 assert((len % sizeof(ng_ipaddr_t)) == 0);
2150 LogDebug("Got result from resolver: %u structs (%u bytes).", len/sizeof(ng_ipaddr_t), len);
2152 memset(&Conf_Server[i].dst_addr, 0, sizeof(Conf_Server[i].dst_addr));
2153 if (len > sizeof(ng_ipaddr_t)) {
2154 /* more than one address for this hostname, remember them
2155 * in case first address is unreachable/not available */
2156 len -= sizeof(ng_ipaddr_t);
2157 if (len > sizeof(Conf_Server[i].dst_addr)) {
2158 len = sizeof(Conf_Server[i].dst_addr);
2160 "Notice: Resolver returned more IP Addresses for host than we can handle, additional addresses dropped.");
2162 memcpy(&Conf_Server[i].dst_addr, &dest_addrs[1], len);
2165 New_Server(i, dest_addrs);
2166 } /* cb_Read_Forward_Lookup */
2170 * Read results of a resolver sub-process from the pipe and update the
2171 * apropriate connection/client structure(s): hostname and/or IDENT user name.
2173 * @param r_fd File descriptor of the pipe to the sub-process.
2174 * @param events (ignored IO specification)
2177 cb_Read_Resolver_Result( int r_fd, UNUSED short events )
2184 char readbuf[HOST_LEN + 2 + CLIENT_USER_LEN];
2187 char readbuf[HOST_LEN + 1];
2190 LogDebug("Resolver: Got callback on fd %d, events %d", r_fd, events );
2191 i = Conn_GetFromProc(r_fd);
2193 /* Ops, none found? Probably the connection has already
2194 * been closed!? We'll ignore that ... */
2196 LogDebug("Resolver: Got callback for unknown connection!?");
2200 /* Read result from pipe */
2201 len = Proc_Read(&My_Connections[i].proc_stat, readbuf, sizeof readbuf -1);
2202 Proc_Close(&My_Connections[i].proc_stat);
2206 readbuf[len] = '\0';
2207 identptr = strchr(readbuf, '\n');
2208 assert(identptr != NULL);
2210 Log( LOG_CRIT, "Resolver: Got malformed result!");
2215 LogDebug("Got result from resolver: \"%s\" (%u bytes read).", readbuf, len);
2216 /* Okay, we got a complete result: this is a host name for outgoing
2217 * connections and a host name and IDENT user name (if enabled) for
2218 * incoming connections.*/
2219 assert ( My_Connections[i].sock >= 0 );
2220 /* Incoming connection. Search client ... */
2221 c = Conn_GetClient( i );
2222 assert( c != NULL );
2224 /* Only update client information of unregistered clients.
2225 * Note: user commands (e. g. WEBIRC) are always read _after_ reading
2226 * the resolver results, so we don't have to worry to override settings
2227 * from these commands here. */
2228 if(Client_Type(c) == CLIENT_UNKNOWN) {
2229 strlcpy(My_Connections[i].host, readbuf,
2230 sizeof(My_Connections[i].host));
2231 Client_SetHostname(c, readbuf);
2232 if (Conf_NoticeAuth)
2233 (void)Conn_WriteStr(i,
2234 "NOTICE AUTH :*** Found your hostname");
2240 if ((*ptr < '0' || *ptr > '9') &&
2241 (*ptr < 'A' || *ptr > 'Z') &&
2242 (*ptr < 'a' || *ptr > 'z'))
2247 /* Erroneous IDENT reply */
2249 "Got invalid IDENT reply for connection %d! Ignored.",
2253 "IDENT lookup for connection %d: \"%s\".",
2255 Client_SetUser(c, identptr, true);
2257 if (Conf_NoticeAuth) {
2258 (void)Conn_WriteStr(i,
2259 "NOTICE AUTH :*** Got %sident response",
2260 *ptr ? "invalid " : "");
2263 Log(LOG_INFO, "IDENT lookup for connection %d: no result.", i);
2264 if (Conf_NoticeAuth && Conf_Ident)
2265 (void)Conn_WriteStr(i,
2266 "NOTICE AUTH :*** No ident response");
2269 Class_HandleServerBans(c);
2272 else Log( LOG_DEBUG, "Resolver: discarding result for already registered connection %d.", i );
2274 } /* cb_Read_Resolver_Result */
2278 * Write a "simple" (error) message to a socket.
2280 * The message is sent without using the connection write buffers, without
2281 * compression/encryption, and even without any error reporting. It is
2282 * designed for error messages of e.g. New_Connection().
2284 * @param Sock Socket handle.
2285 * @param Msg Message string to send.
2288 Simple_Message(int Sock, const char *Msg)
2290 char buf[COMMAND_LEN];
2293 assert(Sock > NONE);
2294 assert(Msg != NULL);
2296 strlcpy(buf, Msg, sizeof buf - 2);
2297 len = strlcat(buf, "\r\n", sizeof buf);
2298 if (write(Sock, buf, len) < 0) {
2299 /* Because this function most probably got called to log
2300 * an error message, any write error is ignored here to
2301 * avoid an endless loop. But casting the result of write()
2302 * to "void" doesn't satisfy the GNU C code attribute
2303 * "warn_unused_result" which is used by some versions of
2304 * glibc (e.g. 2.11.1), therefore this silly error
2305 * "handling" code here :-( */
2308 } /* Simple_Error */
2312 * Get CLIENT structure that belongs to a local connection identified by its
2313 * index number. Each connection belongs to a client by definition, so it is
2314 * not required that the caller checks for NULL return values.
2316 * @param Idx Connection index number.
2317 * @returns Pointer to CLIENT structure.
2320 Conn_GetClient( CONN_ID Idx )
2325 c = array_get(&My_ConnArray, sizeof (CONNECTION), (size_t)Idx);
2327 return c ? c->client : NULL;
2331 * Get PROC_STAT sub-process structure of a connection.
2333 * @param Idx Connection index number.
2334 * @returns PROC_STAT structure.
2337 Conn_GetProcStat(CONN_ID Idx)
2342 c = array_get(&My_ConnArray, sizeof (CONNECTION), (size_t)Idx);
2344 return &c->proc_stat;
2345 } /* Conn_GetProcStat */
2349 * Get CONN_ID from file descriptor associated to a subprocess structure.
2351 * @param fd File descriptor.
2352 * @returns CONN_ID or NONE (-1).
2355 Conn_GetFromProc(int fd)
2360 for (i = 0; i < Pool_Size; i++) {
2361 if ((My_Connections[i].sock != NONE)
2362 && (Proc_GetPipeFd(&My_Connections[i].proc_stat) == fd))
2366 } /* Conn_GetFromProc */
2372 Conn_GetAuthPing(CONN_ID Idx)
2374 assert (Idx != NONE);
2375 return My_Connections[Idx].auth_ping;
2376 } /* Conn_GetAuthPing */
2379 Conn_SetAuthPing(CONN_ID Idx, long ID)
2381 assert (Idx != NONE);
2382 My_Connections[Idx].auth_ping = ID;
2383 } /* Conn_SetAuthPing */
2391 * Get information about used SSL chiper.
2393 * @param Idx Connection index number.
2394 * @param buf Buffer for returned information text.
2395 * @param len Size of return buffer "buf".
2396 * @returns true on success, false otherwise.
2399 Conn_GetCipherInfo(CONN_ID Idx, char *buf, size_t len)
2403 assert(Idx < (int) array_length(&My_ConnArray, sizeof(CONNECTION)));
2404 return ConnSSL_GetCipherInfo(&My_Connections[Idx], buf, len);
2409 * Check if a connection is SSL-enabled or not.
2411 * @param Idx Connection index number.
2412 * @return true if connection is SSL-enabled, false otherwise.
2415 Conn_UsesSSL(CONN_ID Idx)
2419 assert(Idx < (int) array_length(&My_ConnArray, sizeof(CONNECTION)));
2420 return Conn_OPTION_ISSET(&My_Connections[Idx], CONN_SSL);
2429 * Dump internal state of the "connection module".
2432 Conn_DebugDump(void)
2436 Log(LOG_DEBUG, "Connection status:");
2437 for (i = 0; i < Pool_Size; i++) {
2438 if (My_Connections[i].sock == NONE)
2441 " - %d: host=%s, lastdata=%ld, lastping=%ld, delaytime=%ld, flag=%d, options=%d, bps=%d, client=%s",
2442 My_Connections[i].sock, My_Connections[i].host,
2443 My_Connections[i].lastdata, My_Connections[i].lastping,
2444 My_Connections[i].delaytime, My_Connections[i].flag,
2445 My_Connections[i].options, My_Connections[i].bps,
2446 My_Connections[i].client ? Client_ID(My_Connections[i].client) : "-");
2448 } /* Conn_DumpClients */