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 */
922 Conn_Password( CONN_ID Idx )
924 assert( Idx > NONE );
925 return My_Connections[Idx].pwd;
926 } /* Conn_Password */
929 Conn_SetPassword( CONN_ID Idx, const char *Pwd )
931 assert( Idx > NONE );
932 strlcpy( My_Connections[Idx].pwd, Pwd,
933 sizeof(My_Connections[Idx].pwd) );
934 } /* Conn_SetPassword */
937 * Append Data to the outbound write buffer of a connection.
939 * @param Idx Index of the connection.
940 * @param Data pointer to the data.
941 * @param Len length of Data.
942 * @returns true on success, false otherwise.
945 Conn_Write( CONN_ID Idx, char *Data, size_t Len )
948 size_t writebuf_limit = WRITEBUFFER_MAX_LEN;
949 assert( Idx > NONE );
950 assert( Data != NULL );
953 /* Is the socket still open? A previous call to Conn_Write()
954 * may have closed the connection due to a fatal error.
955 * In this case it is sufficient to return an error, as well. */
956 if (My_Connections[Idx].sock <= NONE) {
957 LogDebug("Skipped write on closed socket (connection %d).", Idx);
961 /* Make sure that there still exists a CLIENT structure associated
962 * with this connection and check if this is a server or not: */
963 c = Conn_GetClient(Idx);
965 /* Servers do get special write buffer limits, so they can
966 * generate all the messages that are required while peering. */
967 if (Client_Type(c) == CLIENT_SERVER)
968 writebuf_limit = WRITEBUFFER_SLINK_LEN;
970 LogDebug("Write on socket without client (connection %d)!?", Idx);
973 if ( Conn_OPTION_ISSET( &My_Connections[Idx], CONN_ZIP )) {
975 * Zip_Buffer() does all the dirty work for us: it flushes
976 * the (pre-)compression buffers if required and handles
977 * all error conditions. */
978 if (!Zip_Buffer(Idx, Data, Len))
984 /* Uncompressed link:
985 * Check if outbound buffer has enough space for the data. */
986 if (array_bytes(&My_Connections[Idx].wbuf) + Len >=
987 WRITEBUFFER_FLUSH_LEN) {
988 /* Buffer is full, flush it. Handle_Write deals with
989 * low-level errors, if any. */
990 if (!Handle_Write(Idx))
994 /* When the write buffer is still too big after flushing it,
995 * the connection will be killed. */
996 if (array_bytes(&My_Connections[Idx].wbuf) + Len >=
999 "Write buffer space exhausted (connection %d, limit is %lu bytes, %lu bytes new, %lu bytes pending)",
1000 Idx, writebuf_limit, Len,
1001 (unsigned long)array_bytes(&My_Connections[Idx].wbuf));
1002 Conn_Close(Idx, "Write buffer space exhausted", NULL, false);
1006 /* Copy data to write buffer */
1007 if (!array_catb(&My_Connections[Idx].wbuf, Data, Len))
1010 My_Connections[Idx].bytes_out += Len;
1013 /* Adjust global write counter */
1021 * Shut down a connection.
1023 * @param Idx Connection index.
1024 * @param LogMsg Message to write to the log or NULL. If no LogMsg
1025 * is given, the FwdMsg is logged.
1026 * @param FwdMsg Message to forward to remote servers.
1027 * @param InformClient If true, inform the client on the connection which is
1028 * to be shut down of the reason (FwdMsg) and send
1029 * connection statistics before disconnecting it.
1032 Conn_Close( CONN_ID Idx, const char *LogMsg, const char *FwdMsg, bool InformClient )
1034 /* Close connection. Open pipes of asynchronous resolver
1035 * sub-processes are closed down. */
1041 double in_z_k, out_z_k;
1045 assert( Idx > NONE );
1047 /* Is this link already shutting down? */
1048 if( Conn_OPTION_ISSET( &My_Connections[Idx], CONN_ISCLOSING )) {
1049 /* Conn_Close() has been called recursively for this link;
1050 * probabe reason: Handle_Write() failed -- see below. */
1051 LogDebug("Recursive request to close connection: %d", Idx );
1055 assert( My_Connections[Idx].sock > NONE );
1057 /* Mark link as "closing" */
1058 Conn_OPTION_ADD( &My_Connections[Idx], CONN_ISCLOSING );
1060 port = ng_ipaddr_getport(&My_Connections[Idx].addr);
1061 Log(LOG_INFO, "Shutting down connection %d (%s) with %s:%d ...", Idx,
1062 LogMsg ? LogMsg : FwdMsg, My_Connections[Idx].host, port);
1064 /* Search client, if any */
1065 c = Conn_GetClient( Idx );
1067 /* Should the client be informed? */
1070 /* Send statistics to client if registered as user: */
1071 if ((c != NULL) && (Client_Type(c) == CLIENT_USER)) {
1073 ":%s NOTICE %s :%sConnection statistics: client %.1f kb, server %.1f kb.",
1074 Client_ID(Client_ThisServer()), Client_ID(c),
1076 (double)My_Connections[Idx].bytes_in / 1024,
1077 (double)My_Connections[Idx].bytes_out / 1024);
1080 /* Send ERROR to client (see RFC 2812, section 3.1.7) */
1082 Conn_WriteStr(Idx, "ERROR :%s", FwdMsg);
1084 Conn_WriteStr(Idx, "ERROR :Closing connection");
1087 /* Try to write out the write buffer. Note: Handle_Write() eventually
1088 * removes the CLIENT structure associated with this connection if an
1089 * error occurs! So we have to re-check if there is still an valid
1090 * CLIENT structure after calling Handle_Write() ...*/
1091 (void)Handle_Write( Idx );
1093 /* Search client, if any (re-check!) */
1094 c = Conn_GetClient( Idx );
1096 if ( Conn_OPTION_ISSET( &My_Connections[Idx], CONN_SSL )) {
1097 Log(LOG_INFO, "SSL connection %d shutting down ...", Idx);
1098 ConnSSL_Free(&My_Connections[Idx]);
1101 /* Shut down socket */
1102 if (! io_close(My_Connections[Idx].sock)) {
1103 /* Oops, we can't close the socket!? This is ... ugly! */
1105 "Error closing connection %d (socket %d) with %s:%d - %s! (ignored)",
1106 Idx, My_Connections[Idx].sock, My_Connections[Idx].host,
1107 port, strerror(errno));
1110 /* Mark socket as invalid: */
1111 My_Connections[Idx].sock = NONE;
1113 /* If there is still a client, unregister it now */
1115 Client_Destroy(c, LogMsg, FwdMsg, true);
1117 /* Calculate statistics and log information */
1118 in_k = (double)My_Connections[Idx].bytes_in / 1024;
1119 out_k = (double)My_Connections[Idx].bytes_out / 1024;
1121 if (Conn_OPTION_ISSET( &My_Connections[Idx], CONN_ZIP)) {
1122 in_z_k = (double)My_Connections[Idx].zip.bytes_in / 1024;
1123 out_z_k = (double)My_Connections[Idx].zip.bytes_out / 1024;
1124 /* Make sure that no division by zero can occur during
1125 * the calculation of in_p and out_p: in_z_k and out_z_k
1126 * are non-zero, that's guaranteed by the protocol until
1127 * compression can be enabled. */
1132 in_p = (int)(( in_k * 100 ) / in_z_k );
1133 out_p = (int)(( out_k * 100 ) / out_z_k );
1135 "Connection %d with %s:%d closed (in: %.1fk/%.1fk/%d%%, out: %.1fk/%.1fk/%d%%).",
1136 Idx, My_Connections[Idx].host, port,
1137 in_k, in_z_k, in_p, out_k, out_z_k, out_p);
1143 "Connection %d with %s:%d closed (in: %.1fk, out: %.1fk).",
1144 Idx, My_Connections[Idx].host, port,
1148 /* Servers: Modify time of next connect attempt? */
1149 Conf_UnsetServer( Idx );
1152 /* Clean up zlib, if link was compressed */
1153 if ( Conn_OPTION_ISSET( &My_Connections[Idx], CONN_ZIP )) {
1154 inflateEnd( &My_Connections[Idx].zip.in );
1155 deflateEnd( &My_Connections[Idx].zip.out );
1156 array_free(&My_Connections[Idx].zip.rbuf);
1157 array_free(&My_Connections[Idx].zip.wbuf);
1161 array_free(&My_Connections[Idx].rbuf);
1162 array_free(&My_Connections[Idx].wbuf);
1164 /* Clean up connection structure (=free it) */
1165 Init_Conn_Struct( Idx );
1167 assert(NumConnections > 0);
1170 LogDebug("Shutdown of connection %d completed, %ld connection%s left.",
1171 Idx, NumConnections, NumConnections != 1 ? "s" : "");
1176 * Get current number of connections.
1178 * @returns Number of current connections.
1183 return NumConnections;
1188 * Get number of maximum simultaneous connections.
1190 * @returns Number of maximum simultaneous connections.
1195 return NumConnectionsMax;
1196 } /* Conn_CountMax */
1200 * Get number of connections accepted since the daemon startet.
1202 * @returns Number of connections accepted.
1205 Conn_CountAccepted(void)
1207 return NumConnectionsAccepted;
1208 } /* Conn_CountAccepted */
1212 * Synchronize established connections and configured server structures
1213 * after a configuration update and store the correct connection IDs, if any.
1216 Conn_SyncServerStruct(void)
1222 for (i = 0; i < Pool_Size; i++) {
1223 if (My_Connections[i].sock == NONE)
1227 client = Conn_GetClient(i);
1228 if (!client || Client_Type(client) != CLIENT_SERVER)
1231 for (c = 0; c < MAX_SERVERS; c++) {
1232 /* Configured server? */
1233 if (!Conf_Server[c].host[0])
1236 if (strcasecmp(Conf_Server[c].name, Client_ID(client)) == 0)
1237 Conf_Server[c].conn_id = i;
1240 } /* SyncServerStruct */
1244 * Get IP address string of a connection.
1246 * @param Idx Connection index.
1247 * @return Pointer to a global buffer containing the IP address as string.
1250 Conn_GetIPAInfo(CONN_ID Idx)
1253 return ng_ipaddr_tostr(&My_Connections[Idx].addr);
1258 * Send out data of write buffer; connect new sockets.
1260 * @param Idx Connection index.
1261 * @returns true on success, false otherwise.
1264 Handle_Write( CONN_ID Idx )
1269 assert( Idx > NONE );
1270 if ( My_Connections[Idx].sock < 0 ) {
1271 LogDebug("Handle_Write() on closed socket, connection %d", Idx);
1274 assert( My_Connections[Idx].sock > NONE );
1276 wdatalen = array_bytes(&My_Connections[Idx].wbuf );
1279 if (wdatalen == 0) {
1280 /* Write buffer is empty, so we try to flush the compression
1281 * buffer and get some data to work with from there :-) */
1282 if (!Zip_Flush(Idx))
1285 /* Now the write buffer most probably has changed: */
1286 wdatalen = array_bytes(&My_Connections[Idx].wbuf);
1290 if (wdatalen == 0) {
1291 /* Still no data, fine. */
1292 io_event_del(My_Connections[Idx].sock, IO_WANTWRITE );
1298 ("Handle_Write() called for connection %d, %ld bytes pending ...",
1303 if ( Conn_OPTION_ISSET( &My_Connections[Idx], CONN_SSL )) {
1304 len = ConnSSL_Write(&My_Connections[Idx], array_start(&My_Connections[Idx].wbuf), wdatalen);
1308 len = write(My_Connections[Idx].sock,
1309 array_start(&My_Connections[Idx].wbuf), wdatalen );
1312 if (errno == EAGAIN || errno == EINTR)
1315 Log(LOG_ERR, "Write error on connection %d (socket %d): %s!",
1316 Idx, My_Connections[Idx].sock, strerror(errno));
1317 Conn_Close(Idx, "Write error!", NULL, false);
1321 /* move any data not yet written to beginning */
1322 array_moveleft(&My_Connections[Idx].wbuf, 1, (size_t)len);
1325 } /* Handle_Write */
1329 * Count established connections to a specific IP address.
1331 * @returns Number of established connections.
1334 Count_Connections(ng_ipaddr_t *a)
1339 for (i = 0; i < Pool_Size; i++) {
1340 if (My_Connections[i].sock <= NONE)
1342 if (ng_ipaddr_ipequal(&My_Connections[i].addr, a))
1346 } /* Count_Connections */
1350 * Initialize new client connection on a listening socket.
1352 * @param Sock Listening socket descriptor.
1353 * @returns Accepted socket descriptor or -1 on error.
1356 New_Connection(int Sock)
1359 struct request_info req;
1361 ng_ipaddr_t new_addr;
1362 char ip_str[NG_INET_ADDRSTRLEN];
1363 int new_sock, new_sock_len, identsock;
1367 assert(Sock > NONE);
1369 LogDebug("Accepting new connection on socket %d ...", Sock);
1371 new_sock_len = (int)sizeof(new_addr);
1372 new_sock = accept(Sock, (struct sockaddr *)&new_addr,
1373 (socklen_t *)&new_sock_len);
1375 Log(LOG_CRIT, "Can't accept connection: %s!", strerror(errno));
1378 NumConnectionsAccepted++;
1380 if (!ng_ipaddr_tostr_r(&new_addr, ip_str)) {
1381 Log(LOG_CRIT, "fd %d: Can't convert IP address!", new_sock);
1382 Simple_Message(new_sock, "ERROR :Internal Server Error");
1388 /* Validate socket using TCP Wrappers */
1389 request_init(&req, RQ_DAEMON, PACKAGE_NAME, RQ_FILE, new_sock,
1390 RQ_CLIENT_SIN, &new_addr, NULL);
1392 if (!hosts_access(&req)) {
1394 "Refused connection from %s (by TCP Wrappers)!", ip_str);
1395 Simple_Message(new_sock, "ERROR :Connection refused");
1401 if (!Init_Socket(new_sock))
1404 /* Check global connection limit */
1405 if ((Conf_MaxConnections > 0) &&
1406 (NumConnections >= (size_t) Conf_MaxConnections)) {
1407 Log(LOG_ALERT, "Can't accept connection: limit (%d) reached!",
1408 Conf_MaxConnections);
1409 Simple_Message(new_sock, "ERROR :Connection limit reached");
1414 /* Check IP-based connection limit */
1415 cnt = Count_Connections(&new_addr);
1416 if ((Conf_MaxConnectionsIP > 0) && (cnt >= Conf_MaxConnectionsIP)) {
1417 /* Access denied, too many connections from this IP address! */
1419 "Refused connection from %s: too may connections (%ld) from this IP address!",
1421 Simple_Message(new_sock,
1422 "ERROR :Connection refused, too many connections from your IP address");
1427 if (new_sock >= Pool_Size) {
1428 if (!array_alloc(&My_ConnArray, sizeof(CONNECTION),
1429 (size_t) new_sock)) {
1431 "Can't allocate memory! [New_Connection]");
1432 Simple_Message(new_sock, "ERROR: Internal error");
1436 LogDebug("Bumped connection pool to %ld items (internal: %ld items, %ld bytes)",
1437 new_sock, array_length(&My_ConnArray,
1438 sizeof(CONNECTION)), array_bytes(&My_ConnArray));
1440 /* Adjust pointer to new block */
1441 My_Connections = array_start(&My_ConnArray);
1442 while (Pool_Size <= new_sock)
1443 Init_Conn_Struct(Pool_Size++);
1446 /* register callback */
1447 if (!io_event_create(new_sock, IO_WANTREAD, cb_clientserver)) {
1449 "Can't accept connection: io_event_create failed!");
1450 Simple_Message(new_sock, "ERROR :Internal error");
1455 c = Client_NewLocal(new_sock, NULL, CLIENT_UNKNOWN, false);
1458 "Can't accept connection: can't create client structure!");
1459 Simple_Message(new_sock, "ERROR :Internal error");
1464 Init_Conn_Struct(new_sock);
1465 My_Connections[new_sock].sock = new_sock;
1466 My_Connections[new_sock].addr = new_addr;
1467 My_Connections[new_sock].client = c;
1469 /* Set initial hostname to IP address. This becomes overwritten when
1470 * the DNS lookup is enabled and succeeds, but is used otherwise. */
1471 if (ng_ipaddr_af(&new_addr) != AF_INET)
1472 snprintf(My_Connections[new_sock].host,
1473 sizeof(My_Connections[new_sock].host), "[%s]", ip_str);
1475 strlcpy(My_Connections[new_sock].host, ip_str,
1476 sizeof(My_Connections[new_sock].host));
1478 Client_SetHostname(c, My_Connections[new_sock].host);
1480 Log(LOG_INFO, "Accepted connection %d from %s:%d on socket %d.",
1481 new_sock, My_Connections[new_sock].host,
1482 ng_ipaddr_getport(&new_addr), Sock);
1484 identsock = new_sock;
1490 if (Conf_NoticeAuth) {
1493 (void)Conn_WriteStr(new_sock,
1494 "NOTICE AUTH :*** Looking up your hostname and checking ident");
1497 (void)Conn_WriteStr(new_sock,
1498 "NOTICE AUTH :*** Looking up your hostname");
1500 Resolve_Addr(&My_Connections[new_sock].proc_stat, &new_addr,
1501 identsock, cb_Read_Resolver_Result);
1504 Account_Connection();
1506 } /* New_Connection */
1510 * Update global connection counters.
1513 Account_Connection(void)
1516 if (NumConnections > NumConnectionsMax)
1517 NumConnectionsMax = NumConnections;
1518 LogDebug("Total number of connections now %lu (max %lu).",
1519 NumConnections, NumConnectionsMax);
1520 } /* Account_Connection */
1524 * Translate socket handle into connection index.
1526 * @param Sock Socket handle.
1527 * @returns Connecion index or NONE, if no connection could be found.
1530 Socket2Index( int Sock )
1532 assert( Sock >= 0 );
1534 if( Sock >= Pool_Size || My_Connections[Sock].sock != Sock ) {
1535 /* the Connection was already closed again, likely due to
1537 LogDebug("Socket2Index: can't get connection for socket %d!", Sock);
1541 } /* Socket2Index */
1545 * Read data from the network to the read buffer. If an error occures,
1546 * the socket of this connection will be shut down.
1548 * @param Idx Connection index.
1551 Read_Request( CONN_ID Idx )
1554 static const unsigned int maxbps = COMMAND_LEN / 2;
1555 char readbuf[READBUFFER_LEN];
1558 assert( Idx > NONE );
1559 assert( My_Connections[Idx].sock > NONE );
1562 if ((array_bytes(&My_Connections[Idx].rbuf) >= READBUFFER_LEN) ||
1563 (array_bytes(&My_Connections[Idx].zip.rbuf) >= READBUFFER_LEN))
1565 if (array_bytes(&My_Connections[Idx].rbuf) >= READBUFFER_LEN)
1568 /* Read buffer is full */
1570 "Receive buffer space exhausted (connection %d): %d bytes",
1571 Idx, array_bytes(&My_Connections[Idx].rbuf));
1572 Conn_Close(Idx, "Receive buffer space exhausted", NULL, false);
1577 if (Conn_OPTION_ISSET(&My_Connections[Idx], CONN_SSL))
1578 len = ConnSSL_Read( &My_Connections[Idx], readbuf, sizeof(readbuf));
1581 len = read(My_Connections[Idx].sock, readbuf, sizeof(readbuf));
1583 Log(LOG_INFO, "%s:%u (%s) is closing the connection ...",
1584 My_Connections[Idx].host,
1585 (unsigned int) ng_ipaddr_getport(&My_Connections[Idx].addr),
1586 ng_ipaddr_tostr(&My_Connections[Idx].addr));
1588 "Socket closed!", "Client closed connection",
1594 if( errno == EAGAIN ) return;
1595 Log(LOG_ERR, "Read error on connection %d (socket %d): %s!",
1596 Idx, My_Connections[Idx].sock, strerror(errno));
1597 Conn_Close(Idx, "Read error!", "Client closed connection",
1602 if (Conn_OPTION_ISSET(&My_Connections[Idx], CONN_ZIP)) {
1603 if (!array_catb(&My_Connections[Idx].zip.rbuf, readbuf,
1606 "Could not append received data to zip input buffer (connection %d): %d bytes!",
1608 Conn_Close(Idx, "Receive buffer space exhausted", NULL,
1615 if (!array_catb( &My_Connections[Idx].rbuf, readbuf, len)) {
1617 "Could not append received data to input buffer (connection %d): %d bytes!",
1619 Conn_Close(Idx, "Receive buffer space exhausted", NULL, false );
1623 /* Update connection statistics */
1624 My_Connections[Idx].bytes_in += len;
1625 My_Connections[Idx].bps += Handle_Buffer(Idx);
1627 /* Make sure that there is still a valid client registered */
1628 c = Conn_GetClient(Idx);
1632 /* Update timestamp of last data received if this connection is
1633 * registered as a user, server or service connection. Don't update
1634 * otherwise, so users have at least Conf_PongTimeout seconds time to
1635 * register with the IRC server -- see Check_Connections().
1636 * Update "lastping", too, if time shifted backwards ... */
1637 if (Client_Type(c) == CLIENT_USER
1638 || Client_Type(c) == CLIENT_SERVER
1639 || Client_Type(c) == CLIENT_SERVICE) {
1641 if (My_Connections[Idx].lastdata != t)
1642 My_Connections[Idx].bps = 0;
1644 My_Connections[Idx].lastdata = t;
1645 if (My_Connections[Idx].lastping > t)
1646 My_Connections[Idx].lastping = t;
1649 /* Look at the data in the (read-) buffer of this connection */
1650 if (Client_Type(c) != CLIENT_SERVER
1651 && Client_Type(c) != CLIENT_UNKNOWNSERVER
1652 && Client_Type(c) != CLIENT_SERVICE
1653 && My_Connections[Idx].bps >= maxbps) {
1654 LogDebug("Throttling connection %d: BPS exceeded! (%u >= %u)",
1655 Idx, My_Connections[Idx].bps, maxbps);
1656 Conn_SetPenalty(Idx, 1);
1658 } /* Read_Request */
1662 * Handle all data in the connection read-buffer.
1664 * Data is processed until no complete command is left in the read buffer,
1665 * or MAX_COMMANDS[_SERVER|_SERVICE] commands were processed.
1666 * When a fatal error occurs, the connection is shut down.
1668 * @param Idx Index of the connection.
1669 * @returns Number of bytes processed.
1672 Handle_Buffer(CONN_ID Idx)
1675 char *ptr1, *ptr2, *first_eol;
1683 unsigned int i, maxcmd = MAX_COMMANDS, len_processed = 0;
1686 c = Conn_GetClient(Idx);
1687 starttime = time(NULL);
1691 /* Servers get special command limits that depend on the user count */
1692 switch (Client_Type(c)) {
1694 maxcmd = (int)(Client_UserCount() / 5)
1695 + MAX_COMMANDS_SERVER_MIN;
1696 /* Allow servers to handle even more commands while peering
1697 * to speed up server login and network synchronisation. */
1698 if (Conn_LastPing(Idx) == 0)
1701 case CLIENT_SERVICE:
1702 maxcmd = MAX_COMMANDS_SERVICE; break;
1705 for (i=0; i < maxcmd; i++) {
1707 if (My_Connections[Idx].delaytime > starttime)
1710 /* Unpack compressed data, if compression is in use */
1711 if (Conn_OPTION_ISSET(&My_Connections[Idx], CONN_ZIP)) {
1712 /* When unzipping fails, Unzip_Buffer() shuts
1713 * down the connection itself */
1714 if (!Unzip_Buffer(Idx))
1719 if (0 == array_bytes(&My_Connections[Idx].rbuf))
1722 /* Make sure that the buffer is NULL terminated */
1723 if (!array_cat0_temporary(&My_Connections[Idx].rbuf)) {
1724 Conn_Close(Idx, NULL,
1725 "Can't allocate memory [Handle_Buffer]",
1730 /* RFC 2812, section "2.3 Messages", 5th paragraph:
1731 * "IRC messages are always lines of characters terminated
1732 * with a CR-LF (Carriage Return - Line Feed) pair [...]". */
1734 ptr = strstr(array_start(&My_Connections[Idx].rbuf), "\r\n");
1737 /* Check for non-RFC-compliant request (only CR or LF)?
1738 * Unfortunately, there are quite a few clients out there
1739 * that do this -- e. g. mIRC, BitchX, and Trillian :-( */
1740 ptr1 = strchr(array_start(&My_Connections[Idx].rbuf), '\r');
1741 ptr2 = strchr(array_start(&My_Connections[Idx].rbuf), '\n');
1743 /* Check if there is a single CR or LF _before_ the
1744 * corerct CR+LF line terminator: */
1745 first_eol = ptr1 < ptr2 ? ptr1 : ptr2;
1746 if (first_eol < ptr) {
1747 /* Single CR or LF before CR+LF found */
1751 } else if (ptr1 || ptr2) {
1752 /* No CR+LF terminated command found, but single
1753 * CR or LF found ... */
1755 ptr = ptr1 < ptr2 ? ptr1 : ptr2;
1757 ptr = ptr1 ? ptr1 : ptr2;
1765 /* Complete (=line terminated) request found, handle it! */
1768 len = ptr - (char *)array_start(&My_Connections[Idx].rbuf) + delta;
1770 if (len > (COMMAND_LEN - 1)) {
1771 /* Request must not exceed 512 chars (incl. CR+LF!),
1772 * see RFC 2812. Disconnect Client if this happens. */
1774 "Request too long (connection %d): %d bytes (max. %d expected)!",
1775 Idx, array_bytes(&My_Connections[Idx].rbuf),
1777 Conn_Close(Idx, NULL, "Request too long", true);
1781 len_processed += (unsigned int)len;
1783 /* Request is empty (only '\r\n', '\r' or '\n');
1784 * delta is 2 ('\r\n') or 1 ('\r' or '\n'), see above */
1785 array_moveleft(&My_Connections[Idx].rbuf, 1, len);
1789 /* remember if stream is already compressed */
1790 old_z = My_Connections[Idx].options & CONN_ZIP;
1793 My_Connections[Idx].msg_in++;
1795 (Idx, (char *)array_start(&My_Connections[Idx].rbuf)))
1796 return 0; /* error -> connection has been closed */
1798 array_moveleft(&My_Connections[Idx].rbuf, 1, len);
1800 LogDebug("Connection %d: %d bytes left in read buffer.",
1801 Idx, array_bytes(&My_Connections[Idx].rbuf));
1804 if ((!old_z) && (My_Connections[Idx].options & CONN_ZIP) &&
1805 (array_bytes(&My_Connections[Idx].rbuf) > 0)) {
1806 /* The last command activated socket compression.
1807 * Data that was read after that needs to be copied
1808 * to the unzip buffer for decompression: */
1810 (&My_Connections[Idx].zip.rbuf,
1811 &My_Connections[Idx].rbuf)) {
1812 Conn_Close(Idx, NULL,
1813 "Can't allocate memory [Handle_Buffer]",
1818 array_trunc(&My_Connections[Idx].rbuf);
1820 ("Moved already received data (%u bytes) to uncompression buffer.",
1821 array_bytes(&My_Connections[Idx].zip.rbuf));
1825 return len_processed;
1826 } /* Handle_Buffer */
1830 * Check whether established connections are still alive or not.
1831 * If not, play PING-PONG first; and if that doesn't help either,
1832 * disconnect the respective peer.
1835 Check_Connections(void)
1841 for (i = 0; i < Pool_Size; i++) {
1842 if (My_Connections[i].sock < 0)
1845 c = Conn_GetClient(i);
1846 if (c && ((Client_Type(c) == CLIENT_USER)
1847 || (Client_Type(c) == CLIENT_SERVER)
1848 || (Client_Type(c) == CLIENT_SERVICE))) {
1849 /* connected User, Server or Service */
1850 if (My_Connections[i].lastping >
1851 My_Connections[i].lastdata) {
1852 /* We already sent a ping */
1853 if (My_Connections[i].lastping <
1854 time(NULL) - Conf_PongTimeout) {
1857 ("Connection %d: Ping timeout: %d seconds.",
1858 i, Conf_PongTimeout);
1859 snprintf(msg, sizeof(msg), "Ping timeout: %d seconds", Conf_PongTimeout);
1860 Conn_Close(i, NULL, msg, true);
1862 } else if (My_Connections[i].lastdata <
1863 time(NULL) - Conf_PingTimeout) {
1864 /* We need to send a PING ... */
1865 LogDebug("Connection %d: sending PING ...", i);
1867 Conn_WriteStr(i, "PING :%s",
1868 Client_ID(Client_ThisServer()));
1871 /* The connection is not fully established yet, so
1872 * we don't do the PING-PONG game here but instead
1873 * disconnect the client after "a short time" if it's
1874 * still not registered. */
1876 if (My_Connections[i].lastdata <
1877 time(NULL) - Conf_PongTimeout) {
1879 ("Unregistered connection %d timed out ...",
1881 Conn_Close(i, NULL, "Timeout", false);
1885 } /* Check_Connections */
1889 * Check if further server links should be established.
1897 time_now = time(NULL);
1899 /* Check all configured servers */
1900 for (i = 0; i < MAX_SERVERS; i++) {
1901 if (Conf_Server[i].conn_id != NONE)
1902 continue; /* Already establishing or connected */
1903 if (!Conf_Server[i].host[0] || !Conf_Server[i].port > 0)
1904 continue; /* No host and/or port configured */
1905 if (Conf_Server[i].flags & CONF_SFLAG_DISABLED)
1906 continue; /* Disabled configuration entry */
1907 if (Conf_Server[i].lasttry > (time_now - Conf_ConnectRetry))
1908 continue; /* We have to wait a little bit ... */
1910 /* Is there already a connection in this group? */
1911 if (Conf_Server[i].group > NONE) {
1912 for (n = 0; n < MAX_SERVERS; n++) {
1915 if ((Conf_Server[n].conn_id != NONE) &&
1916 (Conf_Server[n].group == Conf_Server[i].group))
1919 if (n < MAX_SERVERS)
1923 /* Okay, try to connect now */
1925 "Preparing to establish a new server link for \"%s\" ...",
1926 Conf_Server[i].name);
1927 Conf_Server[i].lasttry = time_now;
1928 Conf_Server[i].conn_id = SERVER_WAIT;
1929 assert(Proc_GetPipeFd(&Conf_Server[i].res_stat) < 0);
1930 Resolve_Name(&Conf_Server[i].res_stat, Conf_Server[i].host,
1931 cb_Connect_to_Server);
1933 } /* Check_Servers */
1937 * Establish a new outgoing server connection.
1939 * @param Server Configuration index of the server.
1940 * @param dest Destination IP address to connect to.
1943 New_Server( int Server , ng_ipaddr_t *dest)
1945 /* Establish new server link */
1946 char ip_str[NG_INET_ADDRSTRLEN];
1947 int af_dest, res, new_sock;
1950 assert( Server > NONE );
1952 /* Make sure that the remote server hasn't re-linked to this server
1953 * asynchronously on its own */
1954 if (Conf_Server[Server].conn_id > NONE) {
1956 "Connection to \"%s\" meanwhile re-established, aborting preparation.");
1960 if (!ng_ipaddr_tostr_r(dest, ip_str)) {
1961 Log(LOG_WARNING, "New_Server: Could not convert IP to string");
1965 af_dest = ng_ipaddr_af(dest);
1966 new_sock = socket(af_dest, SOCK_STREAM, 0);
1969 "Establishing connection for \"%s\" to \"%s:%d\" (%s), socket %d ...",
1970 Conf_Server[Server].name, Conf_Server[Server].host,
1971 Conf_Server[Server].port, ip_str, new_sock);
1974 Log(LOG_CRIT, "Can't create socket (af %d): %s!",
1975 af_dest, strerror(errno));
1979 if (!Init_Socket(new_sock))
1982 /* is a bind address configured? */
1983 res = ng_ipaddr_af(&Conf_Server[Server].bind_addr);
1984 /* if yes, bind now. If it fails, warn and let connect() pick a source address */
1985 if (res && bind(new_sock, (struct sockaddr *) &Conf_Server[Server].bind_addr,
1986 ng_ipaddr_salen(&Conf_Server[Server].bind_addr)))
1988 ng_ipaddr_tostr_r(&Conf_Server[Server].bind_addr, ip_str);
1989 Log(LOG_WARNING, "Can't bind socket to %s: %s!", ip_str, strerror(errno));
1991 ng_ipaddr_setport(dest, Conf_Server[Server].port);
1992 res = connect(new_sock, (struct sockaddr *) dest, ng_ipaddr_salen(dest));
1993 if(( res != 0 ) && ( errno != EINPROGRESS )) {
1994 Log( LOG_CRIT, "Can't connect socket: %s!", strerror( errno ));
1999 if (!array_alloc(&My_ConnArray, sizeof(CONNECTION), (size_t)new_sock)) {
2001 "Cannot allocate memory for server connection (socket %d)",
2007 if (!io_event_create( new_sock, IO_WANTWRITE, cb_connserver)) {
2008 Log(LOG_ALERT, "io_event_create(): could not add fd %d", strerror(errno));
2013 My_Connections = array_start(&My_ConnArray);
2015 assert(My_Connections[new_sock].sock <= 0);
2017 Init_Conn_Struct(new_sock);
2019 ng_ipaddr_tostr_r(dest, ip_str);
2020 c = Client_NewLocal(new_sock, ip_str, CLIENT_UNKNOWNSERVER, false);
2022 Log( LOG_ALERT, "Can't establish connection: can't create client structure!" );
2027 /* Conn_Close() decrements this counter again */
2028 Account_Connection();
2029 Client_SetIntroducer( c, c );
2030 Client_SetToken( c, TOKEN_OUTBOUND );
2032 /* Register connection */
2033 Conf_SetServer(Server, new_sock);
2034 My_Connections[new_sock].sock = new_sock;
2035 My_Connections[new_sock].addr = *dest;
2036 My_Connections[new_sock].client = c;
2037 strlcpy( My_Connections[new_sock].host, Conf_Server[Server].host,
2038 sizeof(My_Connections[new_sock].host ));
2041 if (Conf_Server[Server].SSLConnect && !ConnSSL_PrepareConnect( &My_Connections[new_sock],
2042 &Conf_Server[Server] ))
2044 Log(LOG_ALERT, "Could not initialize SSL for outgoing connection");
2045 Conn_Close( new_sock, "Could not initialize SSL for outgoing connection", NULL, false );
2046 Init_Conn_Struct( new_sock );
2047 Conf_Server[Server].conn_id = NONE;
2051 LogDebug("Registered new connection %d on socket %d (%ld in total).",
2052 new_sock, My_Connections[new_sock].sock, NumConnections);
2053 Conn_OPTION_ADD( &My_Connections[new_sock], CONN_ISCONNECTING );
2058 * Initialize connection structure.
2060 * @param Idx Connection index.
2063 Init_Conn_Struct(CONN_ID Idx)
2065 time_t now = time(NULL);
2067 memset(&My_Connections[Idx], 0, sizeof(CONNECTION));
2068 My_Connections[Idx].sock = -1;
2069 My_Connections[Idx].signon = now;
2070 My_Connections[Idx].lastdata = now;
2071 My_Connections[Idx].lastprivmsg = now;
2072 Proc_InitStruct(&My_Connections[Idx].proc_stat);
2073 } /* Init_Conn_Struct */
2077 * Initialize options of a new socket.
2079 * For example, we try to set socket options SO_REUSEADDR and IPTOS_LOWDELAY.
2080 * The socket is automatically closed if a fatal error is encountered.
2082 * @param Sock Socket handle.
2083 * @returns false if socket was closed due to fatal error.
2086 Init_Socket( int Sock )
2090 if (!io_setnonblock(Sock)) {
2091 Log( LOG_CRIT, "Can't enable non-blocking mode for socket: %s!", strerror( errno ));
2096 /* Don't block this port after socket shutdown */
2098 if( setsockopt( Sock, SOL_SOCKET, SO_REUSEADDR, &value, (socklen_t)sizeof( value )) != 0 )
2100 Log( LOG_ERR, "Can't set socket option SO_REUSEADDR: %s!", strerror( errno ));
2101 /* ignore this error */
2104 /* Set type of service (TOS) */
2105 #if defined(IPPROTO_IP) && defined(IPTOS_LOWDELAY)
2106 value = IPTOS_LOWDELAY;
2107 if (setsockopt(Sock, IPPROTO_IP, IP_TOS, &value,
2108 (socklen_t) sizeof(value))) {
2109 LogDebug("Can't set socket option IP_TOS: %s!",
2111 /* ignore this error */
2113 LogDebug("IP_TOS on socket %d has been set to IPTOS_LOWDELAY.",
2122 * Read results of a resolver sub-process and try to initiate a new server
2125 * @param fd File descriptor of the pipe to the sub-process.
2126 * @param events (ignored IO specification)
2129 cb_Connect_to_Server(int fd, UNUSED short events)
2131 /* Read result of resolver sub-process from pipe and start connection */
2134 ng_ipaddr_t dest_addrs[4]; /* we can handle at most 3; but we read up to
2135 four so we can log the 'more than we can handle'
2136 condition. First result is tried immediately, rest
2137 is saved for later if needed. */
2139 LogDebug("Resolver: Got forward lookup callback on fd %d, events %d", fd, events);
2141 for (i=0; i < MAX_SERVERS; i++) {
2142 if (Proc_GetPipeFd(&Conf_Server[i].res_stat) == fd )
2146 if( i >= MAX_SERVERS) {
2147 /* Ops, no matching server found?! */
2149 LogDebug("Resolver: Got Forward Lookup callback for unknown server!?");
2153 /* Read result from pipe */
2154 len = Proc_Read(&Conf_Server[i].res_stat, dest_addrs, sizeof(dest_addrs));
2155 Proc_Close(&Conf_Server[i].res_stat);
2157 /* Error resolving hostname: reset server structure */
2158 Conf_Server[i].conn_id = NONE;
2162 assert((len % sizeof(ng_ipaddr_t)) == 0);
2164 LogDebug("Got result from resolver: %u structs (%u bytes).", len/sizeof(ng_ipaddr_t), len);
2166 memset(&Conf_Server[i].dst_addr, 0, sizeof(Conf_Server[i].dst_addr));
2167 if (len > sizeof(ng_ipaddr_t)) {
2168 /* more than one address for this hostname, remember them
2169 * in case first address is unreachable/not available */
2170 len -= sizeof(ng_ipaddr_t);
2171 if (len > sizeof(Conf_Server[i].dst_addr)) {
2172 len = sizeof(Conf_Server[i].dst_addr);
2174 "Notice: Resolver returned more IP Addresses for host than we can handle, additional addresses dropped.");
2176 memcpy(&Conf_Server[i].dst_addr, &dest_addrs[1], len);
2179 New_Server(i, dest_addrs);
2180 } /* cb_Read_Forward_Lookup */
2184 * Read results of a resolver sub-process from the pipe and update the
2185 * apropriate connection/client structure(s): hostname and/or IDENT user name.
2187 * @param r_fd File descriptor of the pipe to the sub-process.
2188 * @param events (ignored IO specification)
2191 cb_Read_Resolver_Result( int r_fd, UNUSED short events )
2198 char readbuf[HOST_LEN + 2 + CLIENT_USER_LEN];
2201 char readbuf[HOST_LEN + 1];
2204 LogDebug("Resolver: Got callback on fd %d, events %d", r_fd, events );
2205 i = Conn_GetFromProc(r_fd);
2207 /* Ops, none found? Probably the connection has already
2208 * been closed!? We'll ignore that ... */
2210 LogDebug("Resolver: Got callback for unknown connection!?");
2214 /* Read result from pipe */
2215 len = Proc_Read(&My_Connections[i].proc_stat, readbuf, sizeof readbuf -1);
2216 Proc_Close(&My_Connections[i].proc_stat);
2220 readbuf[len] = '\0';
2221 identptr = strchr(readbuf, '\n');
2222 assert(identptr != NULL);
2224 Log( LOG_CRIT, "Resolver: Got malformed result!");
2229 LogDebug("Got result from resolver: \"%s\" (%u bytes read).", readbuf, len);
2230 /* Okay, we got a complete result: this is a host name for outgoing
2231 * connections and a host name and IDENT user name (if enabled) for
2232 * incoming connections.*/
2233 assert ( My_Connections[i].sock >= 0 );
2234 /* Incoming connection. Search client ... */
2235 c = Conn_GetClient( i );
2236 assert( c != NULL );
2238 /* Only update client information of unregistered clients.
2239 * Note: user commands (e. g. WEBIRC) are always read _after_ reading
2240 * the resolver results, so we don't have to worry to override settings
2241 * from these commands here. */
2242 if(Client_Type(c) == CLIENT_UNKNOWN) {
2243 strlcpy(My_Connections[i].host, readbuf,
2244 sizeof(My_Connections[i].host));
2245 Client_SetHostname(c, readbuf);
2246 if (Conf_NoticeAuth)
2247 (void)Conn_WriteStr(i,
2248 "NOTICE AUTH :*** Found your hostname");
2254 if ((*ptr < '0' || *ptr > '9') &&
2255 (*ptr < 'A' || *ptr > 'Z') &&
2256 (*ptr < 'a' || *ptr > 'z'))
2261 /* Erroneous IDENT reply */
2263 "Got invalid IDENT reply for connection %d! Ignored.",
2267 "IDENT lookup for connection %d: \"%s\".",
2269 Client_SetUser(c, identptr, true);
2271 if (Conf_NoticeAuth) {
2272 (void)Conn_WriteStr(i,
2273 "NOTICE AUTH :*** Got %sident response",
2274 *ptr ? "invalid " : "");
2277 Log(LOG_INFO, "IDENT lookup for connection %d: no result.", i);
2278 if (Conf_NoticeAuth && Conf_Ident)
2279 (void)Conn_WriteStr(i,
2280 "NOTICE AUTH :*** No ident response");
2283 Class_HandleServerBans(c);
2286 else Log( LOG_DEBUG, "Resolver: discarding result for already registered connection %d.", i );
2288 } /* cb_Read_Resolver_Result */
2292 * Write a "simple" (error) message to a socket.
2294 * The message is sent without using the connection write buffers, without
2295 * compression/encryption, and even without any error reporting. It is
2296 * designed for error messages of e.g. New_Connection().
2298 * @param Sock Socket handle.
2299 * @param Msg Message string to send.
2302 Simple_Message(int Sock, const char *Msg)
2304 char buf[COMMAND_LEN];
2307 assert(Sock > NONE);
2308 assert(Msg != NULL);
2310 strlcpy(buf, Msg, sizeof buf - 2);
2311 len = strlcat(buf, "\r\n", sizeof buf);
2312 if (write(Sock, buf, len) < 0) {
2313 /* Because this function most probably got called to log
2314 * an error message, any write error is ignored here to
2315 * avoid an endless loop. But casting the result of write()
2316 * to "void" doesn't satisfy the GNU C code attribute
2317 * "warn_unused_result" which is used by some versions of
2318 * glibc (e.g. 2.11.1), therefore this silly error
2319 * "handling" code here :-( */
2322 } /* Simple_Error */
2326 * Get CLIENT structure that belongs to a local connection identified by its
2327 * index number. Each connection belongs to a client by definition, so it is
2328 * not required that the caller checks for NULL return values.
2330 * @param Idx Connection index number.
2331 * @returns Pointer to CLIENT structure.
2334 Conn_GetClient( CONN_ID Idx )
2339 c = array_get(&My_ConnArray, sizeof (CONNECTION), (size_t)Idx);
2341 return c ? c->client : NULL;
2345 * Get PROC_STAT sub-process structure of a connection.
2347 * @param Idx Connection index number.
2348 * @returns PROC_STAT structure.
2351 Conn_GetProcStat(CONN_ID Idx)
2356 c = array_get(&My_ConnArray, sizeof (CONNECTION), (size_t)Idx);
2358 return &c->proc_stat;
2359 } /* Conn_GetProcStat */
2363 * Get CONN_ID from file descriptor associated to a subprocess structure.
2365 * @param fd File descriptor.
2366 * @returns CONN_ID or NONE (-1).
2369 Conn_GetFromProc(int fd)
2374 for (i = 0; i < Pool_Size; i++) {
2375 if ((My_Connections[i].sock != NONE)
2376 && (Proc_GetPipeFd(&My_Connections[i].proc_stat) == fd))
2380 } /* Conn_GetFromProc */
2386 Conn_GetAuthPing(CONN_ID Idx)
2388 assert (Idx != NONE);
2389 return My_Connections[Idx].auth_ping;
2390 } /* Conn_GetAuthPing */
2393 Conn_SetAuthPing(CONN_ID Idx, long ID)
2395 assert (Idx != NONE);
2396 My_Connections[Idx].auth_ping = ID;
2397 } /* Conn_SetAuthPing */
2405 * Get information about used SSL chiper.
2407 * @param Idx Connection index number.
2408 * @param buf Buffer for returned information text.
2409 * @param len Size of return buffer "buf".
2410 * @returns true on success, false otherwise.
2413 Conn_GetCipherInfo(CONN_ID Idx, char *buf, size_t len)
2417 assert(Idx < (int) array_length(&My_ConnArray, sizeof(CONNECTION)));
2418 return ConnSSL_GetCipherInfo(&My_Connections[Idx], buf, len);
2423 * Check if a connection is SSL-enabled or not.
2425 * @param Idx Connection index number.
2426 * @return true if connection is SSL-enabled, false otherwise.
2429 Conn_UsesSSL(CONN_ID Idx)
2433 assert(Idx < (int) array_length(&My_ConnArray, sizeof(CONNECTION)));
2434 return Conn_OPTION_ISSET(&My_Connections[Idx], CONN_SSL);
2443 * Dump internal state of the "connection module".
2446 Conn_DebugDump(void)
2450 Log(LOG_DEBUG, "Connection status:");
2451 for (i = 0; i < Pool_Size; i++) {
2452 if (My_Connections[i].sock == NONE)
2455 " - %d: host=%s, lastdata=%ld, lastping=%ld, delaytime=%ld, flag=%d, options=%d, bps=%d, client=%s",
2456 My_Connections[i].sock, My_Connections[i].host,
2457 My_Connections[i].lastdata, My_Connections[i].lastping,
2458 My_Connections[i].delaytime, My_Connections[i].flag,
2459 My_Connections[i].options, My_Connections[i].bps,
2460 My_Connections[i].client ? Client_ID(My_Connections[i].client) : "-");
2462 } /* Conn_DumpClients */