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 <tcpd.h> /* for TCP Wrappers */
66 #include "conn-encoding.h"
69 #include "conn-func.h"
71 #include "ng_ipaddr.h"
79 #define SERVER_WAIT (NONE - 1)
81 #define MAX_COMMANDS 3
82 #define MAX_COMMANDS_SERVER_MIN 10
83 #define MAX_COMMANDS_SERVICE 10
86 static bool Handle_Write PARAMS(( CONN_ID Idx ));
87 static bool Conn_Write PARAMS(( CONN_ID Idx, char *Data, size_t Len ));
88 static int New_Connection PARAMS(( int Sock, bool IsSSL ));
89 static CONN_ID Socket2Index PARAMS(( int Sock ));
90 static void Read_Request PARAMS(( CONN_ID Idx ));
91 static unsigned int Handle_Buffer PARAMS(( CONN_ID Idx ));
92 static void Check_Connections PARAMS(( void ));
93 static void Check_Servers PARAMS(( void ));
94 static void Init_Conn_Struct PARAMS(( CONN_ID Idx ));
95 static bool Init_Socket PARAMS(( int Sock ));
96 static void New_Server PARAMS(( int Server, ng_ipaddr_t *dest ));
97 static void Simple_Message PARAMS(( int Sock, const char *Msg ));
98 static int NewListener PARAMS(( const char *listen_addr, UINT16 Port ));
99 static void Account_Connection PARAMS((void));
102 static array My_Listeners;
103 static array My_ConnArray;
104 static size_t NumConnections, NumConnectionsMax, NumConnectionsAccepted;
107 int allow_severity = LOG_INFO;
108 int deny_severity = LOG_ERR;
111 static void server_login PARAMS((CONN_ID idx));
114 extern struct SSLOptions Conf_SSLOptions;
115 static void cb_connserver_login_ssl PARAMS((int sock, short what));
116 static void cb_clientserver_ssl PARAMS((int sock, short what));
118 static void cb_Read_Resolver_Result PARAMS((int sock, UNUSED short what));
119 static void cb_Connect_to_Server PARAMS((int sock, UNUSED short what));
120 static void cb_clientserver PARAMS((int sock, short what));
124 * IO callback for listening sockets: handle new connections. This callback
125 * gets called when a new non-SSL connection should be accepted.
127 * @param sock Socket descriptor.
128 * @param irrelevant (ignored IO specification)
131 cb_listen(int sock, short irrelevant)
134 (void) New_Connection(sock, false);
140 * IO callback for listening SSL sockets: handle new connections. This callback
141 * gets called when a new SSL-enabled connection should be accepted.
143 * @param sock Socket descriptor.
144 * @param irrelevant (ignored IO specification)
147 cb_listen_ssl(int sock, short irrelevant)
152 fd = New_Connection(sock, true);
155 io_event_setcb(My_Connections[fd].sock, cb_clientserver_ssl);
161 * IO callback for new outgoing non-SSL server connections.
163 * @param sock Socket descriptor.
164 * @param what IO specification (IO_WANTREAD/IO_WANTWRITE/...).
167 cb_connserver(int sock, UNUSED short what)
169 int res, err, server;
171 CONN_ID idx = Socket2Index( sock );
174 LogDebug("cb_connserver wants to write on unknown socket?!");
179 assert(what & IO_WANTWRITE);
181 /* Make sure that the server is still configured; it could have been
182 * removed in the meantime! */
183 server = Conf_GetServer(idx);
185 Log(LOG_ERR, "Connection on socket %d to \"%s\" aborted!",
186 sock, My_Connections[idx].host);
187 Conn_Close(idx, "Connection aborted!", NULL, false);
191 /* connect() finished, get result. */
192 sock_len = (socklen_t)sizeof(err);
193 res = getsockopt(My_Connections[idx].sock, SOL_SOCKET, SO_ERROR,
195 assert(sock_len == sizeof(err));
197 /* Error while connecting? */
198 if ((res != 0) || (err != 0)) {
200 Log(LOG_CRIT, "getsockopt (connection %d): %s!",
201 idx, strerror(errno));
204 "Can't connect socket to \"%s:%d\" (connection %d): %s!",
205 My_Connections[idx].host, Conf_Server[server].port,
208 Conn_Close(idx, "Can't connect", NULL, false);
210 if (ng_ipaddr_af(&Conf_Server[server].dst_addr[0])) {
211 /* more addresses to try... */
212 New_Server(server, &Conf_Server[server].dst_addr[0]);
213 /* connection to dst_addr[0] is now in progress, so
214 * remove this address... */
215 Conf_Server[server].dst_addr[0] =
216 Conf_Server[server].dst_addr[1];
217 memset(&Conf_Server[server].dst_addr[1], 0,
218 sizeof(Conf_Server[server].dst_addr[1]));
223 /* connect() succeeded, remove all additional addresses */
224 memset(&Conf_Server[server].dst_addr, 0,
225 sizeof(Conf_Server[server].dst_addr));
227 Conn_OPTION_DEL( &My_Connections[idx], CONN_ISCONNECTING );
229 if ( Conn_OPTION_ISSET( &My_Connections[idx], CONN_SSL_CONNECT )) {
230 io_event_setcb( sock, cb_connserver_login_ssl );
231 io_event_add( sock, IO_WANTWRITE|IO_WANTREAD );
240 * Login to a remote server.
242 * @param idx Connection index.
245 server_login(CONN_ID idx)
248 "Connection %d (socket %d) with \"%s:%d\" established. Now logging in ...",
249 idx, My_Connections[idx].sock, My_Connections[idx].host,
250 Conf_Server[Conf_GetServer(idx)].port);
252 io_event_setcb( My_Connections[idx].sock, cb_clientserver);
253 io_event_add( My_Connections[idx].sock, IO_WANTREAD|IO_WANTWRITE);
255 /* Send PASS and SERVER command to peer */
256 Conn_WriteStr( idx, "PASS %s %s", Conf_Server[Conf_GetServer( idx )].pwd_out, NGIRCd_ProtoID );
257 Conn_WriteStr( idx, "SERVER %s :%s", Conf_ServerName, Conf_ServerInfo );
263 * IO callback for new outgoing SSL-enabled server connections.
265 * @param sock Socket descriptor.
266 * @param unused (ignored IO specification)
269 cb_connserver_login_ssl(int sock, short unused)
271 CONN_ID idx = Socket2Index(sock);
279 switch (ConnSSL_Connect( &My_Connections[idx])) {
281 case 0: LogDebug("ConnSSL_Connect: not ready");
284 Log(LOG_ERR, "SSL connection on socket %d failed!", sock);
285 Conn_Close(idx, "Can't connect", NULL, false);
289 Log( LOG_INFO, "SSL connection %d with \"%s:%d\" established.", idx,
290 My_Connections[idx].host, Conf_Server[Conf_GetServer( idx )].port );
298 * IO callback for established non-SSL client and server connections.
300 * @param sock Socket descriptor.
301 * @param what IO specification (IO_WANTREAD/IO_WANTWRITE/...).
304 cb_clientserver(int sock, short what)
306 CONN_ID idx = Socket2Index(sock);
315 if (what & IO_WANTREAD
316 || (Conn_OPTION_ISSET(&My_Connections[idx], CONN_SSL_WANT_WRITE))) {
317 /* if TLS layer needs to write additional data, call
318 * Read_Request() instead so that SSL/TLS can continue */
322 if (what & IO_WANTREAD)
325 if (what & IO_WANTWRITE)
332 * IO callback for established SSL-enabled client and server connections.
334 * @param sock Socket descriptor.
335 * @param what IO specification (IO_WANTREAD/IO_WANTWRITE/...).
338 cb_clientserver_ssl(int sock, short what)
340 CONN_ID idx = Socket2Index(sock);
349 switch (ConnSSL_Accept(&My_Connections[idx])) {
353 return; /* EAGAIN: callback will be invoked again by IO layer */
355 Conn_Close(idx, "SSL accept error, closing socket", "SSL accept error", false);
358 if (what & IO_WANTREAD)
361 if (what & IO_WANTWRITE)
364 io_event_setcb(sock, cb_clientserver); /* SSL handshake completed */
370 * Initialize connecion module.
377 /* Speicher fuer Verbindungs-Pool anfordern */
378 Pool_Size = CONNECTION_POOL;
379 if ((Conf_MaxConnections > 0) &&
380 (Pool_Size > Conf_MaxConnections))
381 Pool_Size = Conf_MaxConnections;
383 if (!array_alloc(&My_ConnArray, sizeof(CONNECTION), (size_t)Pool_Size)) {
384 Log(LOG_EMERG, "Can't allocate memory! [Conn_Init]");
388 /* FIXME: My_Connetions/Pool_Size is needed by other parts of the
389 * code; remove them! */
390 My_Connections = (CONNECTION*) array_start(&My_ConnArray);
392 LogDebug("Allocated connection pool for %d items (%ld bytes).",
393 array_length(&My_ConnArray, sizeof(CONNECTION)),
394 array_bytes(&My_ConnArray));
396 assert(array_length(&My_ConnArray, sizeof(CONNECTION)) >= (size_t)Pool_Size);
398 array_free( &My_Listeners );
400 for (i = 0; i < Pool_Size; i++)
406 * Clean up connection module.
413 Conn_ExitListeners();
415 LogDebug("Shutting down all connections ..." );
416 for( idx = 0; idx < Pool_Size; idx++ ) {
417 if( My_Connections[idx].sock > NONE ) {
418 Conn_Close( idx, NULL, NGIRCd_SignalRestart ?
419 "Server going down (restarting)":"Server going down", true );
423 array_free(&My_ConnArray);
424 My_Connections = NULL;
426 io_library_shutdown();
431 * Close all sockets (file descriptors) of open connections.
432 * This is useful in forked child processes, for example, to make sure that
433 * they don't hold connections open that the main process wants to close.
436 Conn_CloseAllSockets(int ExceptOf)
440 for(idx = 0; idx < Pool_Size; idx++) {
441 if(My_Connections[idx].sock > NONE &&
442 My_Connections[idx].sock != ExceptOf)
443 close(My_Connections[idx].sock);
449 * Initialize listening ports.
451 * @param a Array containing the ports the daemon should listen on.
452 * @param listen_addr Address the socket should listen on (can be "0.0.0.0").
453 * @param func IO callback function to register.
454 * @returns Number of listening sockets created.
457 ports_initlisteners(array *a, const char *listen_addr, void (*func)(int,short))
459 unsigned int created = 0;
464 len = array_length(a, sizeof (UINT16));
465 port = array_start(a);
467 fd = NewListener(listen_addr, *port);
472 if (!io_event_create( fd, IO_WANTREAD, func )) {
473 Log( LOG_ERR, "io_event_create(): Could not add listening fd %d (port %u): %s!",
474 fd, (unsigned int) *port, strerror(errno));
487 * Initialize all listening sockets.
489 * @returns Number of created listening sockets
492 Conn_InitListeners( void )
494 /* Initialize ports on which the server should accept connections */
495 unsigned int created = 0;
496 char *copy, *listen_addr;
498 assert(Conf_ListenAddress);
500 /* can't use Conf_ListenAddress directly, see below */
501 copy = strdup(Conf_ListenAddress);
503 Log(LOG_CRIT, "Cannot copy %s: %s", Conf_ListenAddress, strerror(errno));
506 listen_addr = strtok(copy, ",");
508 while (listen_addr) {
509 ngt_TrimStr(listen_addr);
511 created += ports_initlisteners(&Conf_ListenPorts, listen_addr, cb_listen);
513 created += ports_initlisteners(&Conf_SSLOptions.ListenPorts, listen_addr, cb_listen_ssl);
517 listen_addr = strtok(NULL, ",");
520 /* Can't free() Conf_ListenAddress here: on REHASH, if the config file
521 * cannot be re-loaded, we'd end up with a NULL Conf_ListenAddress.
522 * Instead, free() takes place in conf.c, before the config file
523 * is being parsed. */
527 } /* Conn_InitListeners */
531 * Shut down all listening sockets.
534 Conn_ExitListeners( void )
536 /* Close down all listening sockets */
540 arraylen = array_length(&My_Listeners, sizeof (int));
542 "Shutting down all listening sockets (%d total) ...", arraylen);
543 fd = array_start(&My_Listeners);
548 LogDebug("Listening socket %d closed.", *fd );
551 array_free(&My_Listeners);
552 } /* Conn_ExitListeners */
556 * Bind a socket to a specific (source) address.
558 * @param addr Address structure.
559 * @param listen_addrstr Source address as string.
560 * @param Port Port number.
561 * @returns true on success, false otherwise.
564 InitSinaddrListenAddr(ng_ipaddr_t *addr, const char *listen_addrstr, UINT16 Port)
568 ret = ng_ipaddr_init(addr, listen_addrstr, Port);
570 assert(listen_addrstr);
571 Log(LOG_CRIT, "Can't bind to [%s]:%u: can't convert ip address \"%s\"!",
572 listen_addrstr, Port, listen_addrstr);
579 * Set a socket to "IPv6 only". If the given socket doesn't belong to the
580 * AF_INET6 family, or the operating system doesn't support this functionality,
581 * this function retruns silently.
583 * @param af Address family of the socket.
584 * @param sock Socket handle.
587 set_v6_only(int af, int sock)
589 #if defined(IPV6_V6ONLY) && defined(WANT_IPV6)
595 if (setsockopt(sock, IPPROTO_IPV6, IPV6_V6ONLY, &on, (socklen_t)sizeof(on)))
596 Log(LOG_ERR, "Could not set IPV6_V6ONLY: %s", strerror(errno));
605 * Initialize new listening port.
607 * @param listen_addr Local address to bind the socet to (can be 0.0.0.0).
608 * @param Port Port number on which the new socket should be listening.
609 * @returns file descriptor of the socket or -1 on failure.
612 NewListener(const char *listen_addr, UINT16 Port)
614 /* Create new listening socket on specified port */
618 if (!InitSinaddrListenAddr(&addr, listen_addr, Port))
621 af = ng_ipaddr_af(&addr);
622 sock = socket(af, SOCK_STREAM, 0);
624 Log(LOG_CRIT, "Can't create socket (af %d) : %s!", af, strerror(errno));
628 set_v6_only(af, sock);
630 if (!Init_Socket(sock))
633 if (bind(sock, (struct sockaddr *)&addr, ng_ipaddr_salen(&addr)) != 0) {
634 Log(LOG_CRIT, "Can't bind socket to address %s:%d - %s!",
635 ng_ipaddr_tostr(&addr), Port, strerror(errno));
640 if( listen( sock, 10 ) != 0 ) {
641 Log( LOG_CRIT, "Can't listen on socket: %s!", strerror( errno ));
646 /* keep fd in list so we can close it when ngircd restarts/shuts down */
647 if (!array_catb( &My_Listeners,(char*) &sock, sizeof(int) )) {
648 Log( LOG_CRIT, "Can't add socket to My_Listeners array: %s!", strerror( errno ));
653 Log(LOG_INFO, "Now listening on [%s]:%d (socket %d).",
654 ng_ipaddr_tostr(&addr), Port, sock);
662 * Check if SSL library needs to read SSL-protocol related data.
664 * SSL/TLS connections require extra treatment:
665 * When either CONN_SSL_WANT_WRITE or CONN_SSL_WANT_READ is set, we
666 * need to take care of that first, before checking read/write buffers.
667 * For instance, while we might have data in our write buffer, the
668 * TLS/SSL protocol might need to read internal data first for TLS/SSL
671 * If this function returns true, such a condition is met and we have
672 * to reverse the condition (check for read even if we've data to write,
673 * do not check for read but writeability even if write-buffer is empty).
675 * @param c Connection to check.
676 * @returns true if SSL-library has to read protocol data.
679 SSL_WantRead(const CONNECTION *c)
681 if (Conn_OPTION_ISSET(c, CONN_SSL_WANT_READ)) {
682 io_event_add(c->sock, IO_WANTREAD);
689 * Check if SSL library needs to write SSL-protocol related data.
691 * Please see description of SSL_WantRead() for full description!
693 * @param c Connection to check.
694 * @returns true if SSL-library has to write protocol data.
697 SSL_WantWrite(const CONNECTION *c)
699 if (Conn_OPTION_ISSET(c, CONN_SSL_WANT_WRITE)) {
700 io_event_add(c->sock, IO_WANTWRITE);
709 SSL_WantRead(UNUSED const CONNECTION *c)
713 SSL_WantWrite(UNUSED const CONNECTION *c)
720 * "Main Loop": Loop until shutdown or restart is signalled.
722 * This function loops until a shutdown or restart of ngIRCd is signalled and
723 * calls io_dispatch() to check for readable and writable sockets every second.
724 * It checks for status changes on pending connections (e. g. when a hostname
725 * has been resolved), checks for "penalties" and timeouts, and handles the
732 unsigned int wdatalen, bytes_processed;
736 while (!NGIRCd_SignalQuit && !NGIRCd_SignalRestart) {
739 /* Check configured servers and established links */
743 /* Expire outdated class/list items */
746 /* Look for non-empty read buffers ... */
747 for (i = 0; i < Pool_Size; i++) {
748 if ((My_Connections[i].sock > NONE)
749 && (array_bytes(&My_Connections[i].rbuf) > 0)
750 && (My_Connections[i].delaytime <= t)) {
751 /* ... and try to handle the received data */
752 bytes_processed = Handle_Buffer(i);
753 /* if we processed data, and there might be
754 * more commands in the input buffer, do not
755 * try to read any more data now */
756 if (bytes_processed &&
757 array_bytes(&My_Connections[i].rbuf) > 2) {
759 ("Throttling connection %d: command limit reached!",
761 Conn_SetPenalty(i, 1);
766 /* Look for non-empty write buffers ... */
767 for (i = 0; i < Pool_Size; i++) {
768 if (My_Connections[i].sock <= NONE)
771 wdatalen = (unsigned int)array_bytes(&My_Connections[i].wbuf);
774 array_bytes(&My_Connections[i].zip.wbuf) > 0)
779 if (SSL_WantRead(&My_Connections[i]))
781 io_event_add(My_Connections[i].sock,
786 /* Check from which sockets we possibly could read ... */
787 for (i = 0; i < Pool_Size; i++) {
788 if (My_Connections[i].sock <= NONE)
791 if (SSL_WantWrite(&My_Connections[i]))
792 continue; /* TLS/SSL layer needs to write data; deal with this first */
794 if (Proc_InProgress(&My_Connections[i].proc_stat)) {
795 /* Wait for completion of forked subprocess
796 * and ignore the socket in the meantime ... */
797 io_event_del(My_Connections[i].sock,
802 if (Conn_OPTION_ISSET(&My_Connections[i], CONN_ISCONNECTING))
803 /* Wait for completion of connect() ... */
806 if (My_Connections[i].delaytime > t) {
807 /* There is a "penalty time" set: ignore socket! */
808 io_event_del(My_Connections[i].sock,
813 io_event_add(My_Connections[i].sock, IO_WANTREAD);
816 /* Set the timeout for reading from the network to 1 second,
817 * which is the granularity with witch we handle "penalty
818 * times" for example.
819 * Note: tv_sec/usec are undefined(!) after io_dispatch()
820 * returns, so we have to set it beforce each call to it! */
824 /* Wait for activity ... */
825 i = io_dispatch(&tv);
826 if (i == -1 && errno != EINTR) {
827 Log(LOG_EMERG, "Conn_Handler(): io_dispatch(): %s!",
829 Log(LOG_ALERT, "%s exiting due to fatal errors!",
835 if (NGIRCd_SignalQuit)
836 Log(LOG_NOTICE | LOG_snotice, "Server going down NOW!");
837 else if (NGIRCd_SignalRestart)
838 Log(LOG_NOTICE | LOG_snotice, "Server restarting NOW!");
843 * Write a text string into the socket of a connection.
845 * This function automatically appends CR+LF to the string and validates that
846 * the result is a valid IRC message (oversized messages are shortened, for
847 * example). Then it calls the Conn_Write() function to do the actual sending.
849 * @param Idx Index fo the connection.
850 * @param Format Format string, see printf().
851 * @returns true on success, false otherwise.
855 Conn_WriteStr(CONN_ID Idx, const char *Format, ...)
858 Conn_WriteStr(Idx, Format, va_alist)
864 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,
909 ptr = strchr(buffer + 1, ':');
912 message = Conn_EncodingTo(Idx, ptr);
914 strlcpy(ptr, message, sizeof(buffer) - (ptr - buffer));
920 Log(LOG_DEBUG, " -> connection %d: '%s'.", Idx, buffer);
923 len = strlcat( buffer, "\r\n", sizeof( buffer ));
924 ok = Conn_Write(Idx, buffer, len);
925 My_Connections[Idx].msg_out++;
929 } /* Conn_WriteStr */
932 Conn_Password( CONN_ID Idx )
934 assert( Idx > NONE );
935 if (My_Connections[Idx].pwd == NULL)
938 return My_Connections[Idx].pwd;
939 } /* Conn_Password */
942 Conn_SetPassword( CONN_ID Idx, const char *Pwd )
944 assert( Idx > NONE );
946 if (My_Connections[Idx].pwd)
947 free(My_Connections[Idx].pwd);
949 My_Connections[Idx].pwd = strdup(Pwd);
950 if (My_Connections[Idx].pwd == NULL) {
951 Log(LOG_EMERG, "Can't allocate memory! [Conn_SetPassword]");
954 } /* Conn_SetPassword */
957 * Append Data to the outbound write buffer of a connection.
959 * @param Idx Index of the connection.
960 * @param Data pointer to the data.
961 * @param Len length of Data.
962 * @returns true on success, false otherwise.
965 Conn_Write( CONN_ID Idx, char *Data, size_t Len )
968 size_t writebuf_limit = WRITEBUFFER_MAX_LEN;
969 assert( Idx > NONE );
970 assert( Data != NULL );
973 /* Is the socket still open? A previous call to Conn_Write()
974 * may have closed the connection due to a fatal error.
975 * In this case it is sufficient to return an error, as well. */
976 if (My_Connections[Idx].sock <= NONE) {
977 LogDebug("Skipped write on closed socket (connection %d).", Idx);
981 /* Make sure that there still exists a CLIENT structure associated
982 * with this connection and check if this is a server or not: */
983 c = Conn_GetClient(Idx);
985 /* Servers do get special write buffer limits, so they can
986 * generate all the messages that are required while peering. */
987 if (Client_Type(c) == CLIENT_SERVER)
988 writebuf_limit = WRITEBUFFER_SLINK_LEN;
990 LogDebug("Write on socket without client (connection %d)!?", Idx);
993 if ( Conn_OPTION_ISSET( &My_Connections[Idx], CONN_ZIP )) {
995 * Zip_Buffer() does all the dirty work for us: it flushes
996 * the (pre-)compression buffers if required and handles
997 * all error conditions. */
998 if (!Zip_Buffer(Idx, Data, Len))
1004 /* Uncompressed link:
1005 * Check if outbound buffer has enough space for the data. */
1006 if (array_bytes(&My_Connections[Idx].wbuf) + Len >=
1007 WRITEBUFFER_FLUSH_LEN) {
1008 /* Buffer is full, flush it. Handle_Write deals with
1009 * low-level errors, if any. */
1010 if (!Handle_Write(Idx))
1014 /* When the write buffer is still too big after flushing it,
1015 * the connection will be killed. */
1016 if (array_bytes(&My_Connections[Idx].wbuf) + Len >=
1019 "Write buffer space exhausted (connection %d, limit is %lu bytes, %lu bytes new, %lu bytes pending)",
1020 Idx, writebuf_limit, Len,
1021 (unsigned long)array_bytes(&My_Connections[Idx].wbuf));
1022 Conn_Close(Idx, "Write buffer space exhausted", NULL, false);
1026 /* Copy data to write buffer */
1027 if (!array_catb(&My_Connections[Idx].wbuf, Data, Len))
1030 My_Connections[Idx].bytes_out += Len;
1033 /* Adjust global write counter */
1041 * Shut down a connection.
1043 * @param Idx Connection index.
1044 * @param LogMsg Message to write to the log or NULL. If no LogMsg
1045 * is given, the FwdMsg is logged.
1046 * @param FwdMsg Message to forward to remote servers.
1047 * @param InformClient If true, inform the client on the connection which is
1048 * to be shut down of the reason (FwdMsg) and send
1049 * connection statistics before disconnecting it.
1052 Conn_Close( CONN_ID Idx, const char *LogMsg, const char *FwdMsg, bool InformClient )
1054 /* Close connection. Open pipes of asynchronous resolver
1055 * sub-processes are closed down. */
1061 double in_z_k, out_z_k;
1065 assert( Idx > NONE );
1067 /* Is this link already shutting down? */
1068 if( Conn_OPTION_ISSET( &My_Connections[Idx], CONN_ISCLOSING )) {
1069 /* Conn_Close() has been called recursively for this link;
1070 * probabe reason: Handle_Write() failed -- see below. */
1071 LogDebug("Recursive request to close connection: %d", Idx );
1075 assert( My_Connections[Idx].sock > NONE );
1077 /* Mark link as "closing" */
1078 Conn_OPTION_ADD( &My_Connections[Idx], CONN_ISCLOSING );
1080 port = ng_ipaddr_getport(&My_Connections[Idx].addr);
1081 Log(LOG_INFO, "Shutting down connection %d (%s) with \"%s:%d\" ...", Idx,
1082 LogMsg ? LogMsg : FwdMsg, My_Connections[Idx].host, port);
1084 /* Search client, if any */
1085 c = Conn_GetClient( Idx );
1087 /* Should the client be informed? */
1090 /* Send statistics to client if registered as user: */
1091 if ((c != NULL) && (Client_Type(c) == CLIENT_USER)) {
1093 ":%s NOTICE %s :%sConnection statistics: client %.1f kb, server %.1f kb.",
1094 Client_ID(Client_ThisServer()), Client_ID(c),
1096 (double)My_Connections[Idx].bytes_in / 1024,
1097 (double)My_Connections[Idx].bytes_out / 1024);
1100 /* Send ERROR to client (see RFC 2812, section 3.1.7) */
1102 Conn_WriteStr(Idx, "ERROR :%s", FwdMsg);
1104 Conn_WriteStr(Idx, "ERROR :Closing connection");
1107 /* Try to write out the write buffer. Note: Handle_Write() eventually
1108 * removes the CLIENT structure associated with this connection if an
1109 * error occurs! So we have to re-check if there is still an valid
1110 * CLIENT structure after calling Handle_Write() ...*/
1111 (void)Handle_Write( Idx );
1113 /* Search client, if any (re-check!) */
1114 c = Conn_GetClient( Idx );
1116 if ( Conn_OPTION_ISSET( &My_Connections[Idx], CONN_SSL )) {
1117 Log(LOG_INFO, "SSL connection %d shutting down ...", Idx);
1118 ConnSSL_Free(&My_Connections[Idx]);
1121 /* Shut down socket */
1122 if (! io_close(My_Connections[Idx].sock)) {
1123 /* Oops, we can't close the socket!? This is ... ugly! */
1125 "Error closing connection %d (socket %d) with %s:%d - %s! (ignored)",
1126 Idx, My_Connections[Idx].sock, My_Connections[Idx].host,
1127 port, strerror(errno));
1130 /* Mark socket as invalid: */
1131 My_Connections[Idx].sock = NONE;
1133 /* If there is still a client, unregister it now */
1135 Client_Destroy(c, LogMsg, FwdMsg, true);
1137 /* Calculate statistics and log information */
1138 in_k = (double)My_Connections[Idx].bytes_in / 1024;
1139 out_k = (double)My_Connections[Idx].bytes_out / 1024;
1141 if (Conn_OPTION_ISSET( &My_Connections[Idx], CONN_ZIP)) {
1142 in_z_k = (double)My_Connections[Idx].zip.bytes_in / 1024;
1143 out_z_k = (double)My_Connections[Idx].zip.bytes_out / 1024;
1144 /* Make sure that no division by zero can occur during
1145 * the calculation of in_p and out_p: in_z_k and out_z_k
1146 * are non-zero, that's guaranteed by the protocol until
1147 * compression can be enabled. */
1152 in_p = (int)(( in_k * 100 ) / in_z_k );
1153 out_p = (int)(( out_k * 100 ) / out_z_k );
1155 "Connection %d with \"%s:%d\" closed (in: %.1fk/%.1fk/%d%%, out: %.1fk/%.1fk/%d%%).",
1156 Idx, My_Connections[Idx].host, port,
1157 in_k, in_z_k, in_p, out_k, out_z_k, out_p);
1163 "Connection %d with \"%s:%d\" closed (in: %.1fk, out: %.1fk).",
1164 Idx, My_Connections[Idx].host, port,
1168 /* Servers: Modify time of next connect attempt? */
1169 Conf_UnsetServer( Idx );
1172 /* Clean up zlib, if link was compressed */
1173 if ( Conn_OPTION_ISSET( &My_Connections[Idx], CONN_ZIP )) {
1174 inflateEnd( &My_Connections[Idx].zip.in );
1175 deflateEnd( &My_Connections[Idx].zip.out );
1176 array_free(&My_Connections[Idx].zip.rbuf);
1177 array_free(&My_Connections[Idx].zip.wbuf);
1181 array_free(&My_Connections[Idx].rbuf);
1182 array_free(&My_Connections[Idx].wbuf);
1183 if (My_Connections[Idx].pwd != NULL)
1184 free(My_Connections[Idx].pwd);
1186 /* Clean up connection structure (=free it) */
1187 Init_Conn_Struct( Idx );
1189 assert(NumConnections > 0);
1192 LogDebug("Shutdown of connection %d completed, %ld connection%s left.",
1193 Idx, NumConnections, NumConnections != 1 ? "s" : "");
1198 * Get current number of connections.
1200 * @returns Number of current connections.
1205 return NumConnections;
1210 * Get number of maximum simultaneous connections.
1212 * @returns Number of maximum simultaneous connections.
1217 return NumConnectionsMax;
1218 } /* Conn_CountMax */
1222 * Get number of connections accepted since the daemon startet.
1224 * @returns Number of connections accepted.
1227 Conn_CountAccepted(void)
1229 return NumConnectionsAccepted;
1230 } /* Conn_CountAccepted */
1234 * Synchronize established connections and configured server structures
1235 * after a configuration update and store the correct connection IDs, if any.
1238 Conn_SyncServerStruct(void)
1244 for (i = 0; i < Pool_Size; i++) {
1245 if (My_Connections[i].sock == NONE)
1249 client = Conn_GetClient(i);
1250 if (!client || Client_Type(client) != CLIENT_SERVER)
1253 for (c = 0; c < MAX_SERVERS; c++) {
1254 /* Configured server? */
1255 if (!Conf_Server[c].host[0])
1258 if (strcasecmp(Conf_Server[c].name, Client_ID(client)) == 0)
1259 Conf_Server[c].conn_id = i;
1262 } /* SyncServerStruct */
1266 * Get IP address string of a connection.
1268 * @param Idx Connection index.
1269 * @return Pointer to a global buffer containing the IP address as string.
1272 Conn_GetIPAInfo(CONN_ID Idx)
1275 return ng_ipaddr_tostr(&My_Connections[Idx].addr);
1280 * Send out data of write buffer; connect new sockets.
1282 * @param Idx Connection index.
1283 * @returns true on success, false otherwise.
1286 Handle_Write( CONN_ID Idx )
1291 assert( Idx > NONE );
1292 if ( My_Connections[Idx].sock < 0 ) {
1293 LogDebug("Handle_Write() on closed socket, connection %d", Idx);
1296 assert( My_Connections[Idx].sock > NONE );
1298 wdatalen = array_bytes(&My_Connections[Idx].wbuf );
1301 if (wdatalen == 0) {
1302 /* Write buffer is empty, so we try to flush the compression
1303 * buffer and get some data to work with from there :-) */
1304 if (!Zip_Flush(Idx))
1307 /* Now the write buffer most probably has changed: */
1308 wdatalen = array_bytes(&My_Connections[Idx].wbuf);
1312 if (wdatalen == 0) {
1313 /* Still no data, fine. */
1314 io_event_del(My_Connections[Idx].sock, IO_WANTWRITE );
1320 ("Handle_Write() called for connection %d, %ld bytes pending ...",
1325 if ( Conn_OPTION_ISSET( &My_Connections[Idx], CONN_SSL )) {
1326 len = ConnSSL_Write(&My_Connections[Idx], array_start(&My_Connections[Idx].wbuf), wdatalen);
1330 len = write(My_Connections[Idx].sock,
1331 array_start(&My_Connections[Idx].wbuf), wdatalen );
1334 if (errno == EAGAIN || errno == EINTR)
1337 Log(LOG_ERR, "Write error on connection %d (socket %d): %s!",
1338 Idx, My_Connections[Idx].sock, strerror(errno));
1339 Conn_Close(Idx, "Write error!", NULL, false);
1343 /* move any data not yet written to beginning */
1344 array_moveleft(&My_Connections[Idx].wbuf, 1, (size_t)len);
1347 } /* Handle_Write */
1351 * Count established connections to a specific IP address.
1353 * @returns Number of established connections.
1356 Count_Connections(ng_ipaddr_t *a)
1361 for (i = 0; i < Pool_Size; i++) {
1362 if (My_Connections[i].sock <= NONE)
1364 if (ng_ipaddr_ipequal(&My_Connections[i].addr, a))
1368 } /* Count_Connections */
1372 * Initialize new client connection on a listening socket.
1374 * @param Sock Listening socket descriptor.
1375 * @param IsSSL true if this socket expects SSL-encrypted data.
1376 * @returns Accepted socket descriptor or -1 on error.
1379 New_Connection(int Sock, UNUSED bool IsSSL)
1382 struct request_info req;
1384 ng_ipaddr_t new_addr;
1385 char ip_str[NG_INET_ADDRSTRLEN];
1386 int new_sock, new_sock_len;
1390 assert(Sock > NONE);
1392 LogDebug("Accepting new connection on socket %d ...", Sock);
1394 new_sock_len = (int)sizeof(new_addr);
1395 new_sock = accept(Sock, (struct sockaddr *)&new_addr,
1396 (socklen_t *)&new_sock_len);
1398 Log(LOG_CRIT, "Can't accept connection: %s!", strerror(errno));
1401 NumConnectionsAccepted++;
1403 if (!ng_ipaddr_tostr_r(&new_addr, ip_str)) {
1404 Log(LOG_CRIT, "fd %d: Can't convert IP address!", new_sock);
1405 Simple_Message(new_sock, "ERROR :Internal Server Error");
1411 /* Validate socket using TCP Wrappers */
1412 request_init(&req, RQ_DAEMON, PACKAGE_NAME, RQ_FILE, new_sock,
1413 RQ_CLIENT_SIN, &new_addr, NULL);
1415 if (!hosts_access(&req)) {
1417 "Refused connection from %s (by TCP Wrappers)!", ip_str);
1418 Simple_Message(new_sock, "ERROR :Connection refused");
1424 if (!Init_Socket(new_sock))
1427 /* Check global connection limit */
1428 if ((Conf_MaxConnections > 0) &&
1429 (NumConnections >= (size_t) Conf_MaxConnections)) {
1430 Log(LOG_ALERT, "Can't accept connection: limit (%d) reached!",
1431 Conf_MaxConnections);
1432 Simple_Message(new_sock, "ERROR :Connection limit reached");
1437 /* Check IP-based connection limit */
1438 cnt = Count_Connections(&new_addr);
1439 if ((Conf_MaxConnectionsIP > 0) && (cnt >= Conf_MaxConnectionsIP)) {
1440 /* Access denied, too many connections from this IP address! */
1442 "Refused connection from %s: too may connections (%ld) from this IP address!",
1444 Simple_Message(new_sock,
1445 "ERROR :Connection refused, too many connections from your IP address");
1450 if (new_sock >= Pool_Size) {
1451 if (!array_alloc(&My_ConnArray, sizeof(CONNECTION),
1452 (size_t) new_sock)) {
1454 "Can't allocate memory! [New_Connection]");
1455 Simple_Message(new_sock, "ERROR: Internal error");
1459 LogDebug("Bumped connection pool to %ld items (internal: %ld items, %ld bytes)",
1460 new_sock, array_length(&My_ConnArray,
1461 sizeof(CONNECTION)), array_bytes(&My_ConnArray));
1463 /* Adjust pointer to new block */
1464 My_Connections = array_start(&My_ConnArray);
1465 while (Pool_Size <= new_sock)
1466 Init_Conn_Struct(Pool_Size++);
1469 /* register callback */
1470 if (!io_event_create(new_sock, IO_WANTREAD, cb_clientserver)) {
1472 "Can't accept connection: io_event_create failed!");
1473 Simple_Message(new_sock, "ERROR :Internal error");
1478 c = Client_NewLocal(new_sock, NULL, CLIENT_UNKNOWN, false);
1481 "Can't accept connection: can't create client structure!");
1482 Simple_Message(new_sock, "ERROR :Internal error");
1487 Init_Conn_Struct(new_sock);
1488 My_Connections[new_sock].sock = new_sock;
1489 My_Connections[new_sock].addr = new_addr;
1490 My_Connections[new_sock].client = c;
1492 /* Set initial hostname to IP address. This becomes overwritten when
1493 * the DNS lookup is enabled and succeeds, but is used otherwise. */
1494 if (ng_ipaddr_af(&new_addr) != AF_INET)
1495 snprintf(My_Connections[new_sock].host,
1496 sizeof(My_Connections[new_sock].host), "[%s]", ip_str);
1498 strlcpy(My_Connections[new_sock].host, ip_str,
1499 sizeof(My_Connections[new_sock].host));
1501 Client_SetHostname(c, My_Connections[new_sock].host);
1503 Log(LOG_INFO, "Accepted connection %d from \"%s:%d\" on socket %d.",
1504 new_sock, My_Connections[new_sock].host,
1505 ng_ipaddr_getport(&new_addr), Sock);
1506 Account_Connection();
1509 /* Delay connection initalization until SSL handshake is finished */
1512 Conn_StartLogin(new_sock);
1515 } /* New_Connection */
1519 * Finish connection initialization, start resolver subprocess.
1521 * @param Idx Connection index.
1524 Conn_StartLogin(CONN_ID Idx)
1526 int ident_sock = -1;
1530 /* Nothing to do if DNS (and resolver subprocess) is disabled */
1535 /* Should we make an IDENT request? */
1537 ident_sock = My_Connections[Idx].sock;
1540 if (Conf_NoticeAuth) {
1541 /* Send "NOTICE AUTH" messages to the client */
1544 (void)Conn_WriteStr(Idx,
1545 "NOTICE AUTH :*** Looking up your hostname and checking ident");
1548 (void)Conn_WriteStr(Idx,
1549 "NOTICE AUTH :*** Looking up your hostname");
1550 (void)Handle_Write(Idx);
1553 Resolve_Addr(&My_Connections[Idx].proc_stat, &My_Connections[Idx].addr,
1554 ident_sock, cb_Read_Resolver_Result);
1559 * Update global connection counters.
1562 Account_Connection(void)
1565 if (NumConnections > NumConnectionsMax)
1566 NumConnectionsMax = NumConnections;
1567 LogDebug("Total number of connections now %lu (max %lu).",
1568 NumConnections, NumConnectionsMax);
1569 } /* Account_Connection */
1573 * Translate socket handle into connection index.
1575 * @param Sock Socket handle.
1576 * @returns Connecion index or NONE, if no connection could be found.
1579 Socket2Index( int Sock )
1581 assert( Sock >= 0 );
1583 if( Sock >= Pool_Size || My_Connections[Sock].sock != Sock ) {
1584 /* the Connection was already closed again, likely due to
1586 LogDebug("Socket2Index: can't get connection for socket %d!", Sock);
1590 } /* Socket2Index */
1594 * Read data from the network to the read buffer. If an error occures,
1595 * the socket of this connection will be shut down.
1597 * @param Idx Connection index.
1600 Read_Request( CONN_ID Idx )
1603 static const unsigned int maxbps = COMMAND_LEN / 2;
1604 char readbuf[READBUFFER_LEN];
1607 assert( Idx > NONE );
1608 assert( My_Connections[Idx].sock > NONE );
1611 if ((array_bytes(&My_Connections[Idx].rbuf) >= READBUFFER_LEN) ||
1612 (array_bytes(&My_Connections[Idx].zip.rbuf) >= READBUFFER_LEN))
1614 if (array_bytes(&My_Connections[Idx].rbuf) >= READBUFFER_LEN)
1617 /* Read buffer is full */
1619 "Receive buffer space exhausted (connection %d): %d bytes",
1620 Idx, array_bytes(&My_Connections[Idx].rbuf));
1621 Conn_Close(Idx, "Receive buffer space exhausted", NULL, false);
1626 if (Conn_OPTION_ISSET(&My_Connections[Idx], CONN_SSL))
1627 len = ConnSSL_Read( &My_Connections[Idx], readbuf, sizeof(readbuf));
1630 len = read(My_Connections[Idx].sock, readbuf, sizeof(readbuf));
1632 LogDebug("Client \"%s:%u\" is closing connection %d ...",
1633 My_Connections[Idx].host,
1634 ng_ipaddr_tostr(&My_Connections[Idx].addr), Idx);
1635 Conn_Close(Idx, NULL, "Client closed connection", false);
1640 if( errno == EAGAIN ) return;
1641 Log(LOG_ERR, "Read error on connection %d (socket %d): %s!",
1642 Idx, My_Connections[Idx].sock, strerror(errno));
1643 Conn_Close(Idx, "Read error", "Client closed connection",
1648 if (Conn_OPTION_ISSET(&My_Connections[Idx], CONN_ZIP)) {
1649 if (!array_catb(&My_Connections[Idx].zip.rbuf, readbuf,
1652 "Could not append received data to zip input buffer (connection %d): %d bytes!",
1654 Conn_Close(Idx, "Receive buffer space exhausted", NULL,
1661 if (!array_catb( &My_Connections[Idx].rbuf, readbuf, len)) {
1663 "Could not append received data to input buffer (connection %d): %d bytes!",
1665 Conn_Close(Idx, "Receive buffer space exhausted", NULL, false );
1669 /* Update connection statistics */
1670 My_Connections[Idx].bytes_in += len;
1671 My_Connections[Idx].bps += Handle_Buffer(Idx);
1673 /* Make sure that there is still a valid client registered */
1674 c = Conn_GetClient(Idx);
1678 /* Update timestamp of last data received if this connection is
1679 * registered as a user, server or service connection. Don't update
1680 * otherwise, so users have at least Conf_PongTimeout seconds time to
1681 * register with the IRC server -- see Check_Connections().
1682 * Update "lastping", too, if time shifted backwards ... */
1683 if (Client_Type(c) == CLIENT_USER
1684 || Client_Type(c) == CLIENT_SERVER
1685 || Client_Type(c) == CLIENT_SERVICE) {
1687 if (My_Connections[Idx].lastdata != t)
1688 My_Connections[Idx].bps = 0;
1690 My_Connections[Idx].lastdata = t;
1691 if (My_Connections[Idx].lastping > t)
1692 My_Connections[Idx].lastping = t;
1695 /* Look at the data in the (read-) buffer of this connection */
1696 if (Client_Type(c) != CLIENT_SERVER
1697 && Client_Type(c) != CLIENT_UNKNOWNSERVER
1698 && Client_Type(c) != CLIENT_SERVICE
1699 && My_Connections[Idx].bps >= maxbps) {
1700 LogDebug("Throttling connection %d: BPS exceeded! (%u >= %u)",
1701 Idx, My_Connections[Idx].bps, maxbps);
1702 Conn_SetPenalty(Idx, 1);
1704 } /* Read_Request */
1708 * Handle all data in the connection read-buffer.
1710 * Data is processed until no complete command is left in the read buffer,
1711 * or MAX_COMMANDS[_SERVER|_SERVICE] commands were processed.
1712 * When a fatal error occurs, the connection is shut down.
1714 * @param Idx Index of the connection.
1715 * @returns Number of bytes processed.
1718 Handle_Buffer(CONN_ID Idx)
1721 char *ptr1, *ptr2, *first_eol;
1729 unsigned int i, maxcmd = MAX_COMMANDS, len_processed = 0;
1732 c = Conn_GetClient(Idx);
1733 starttime = time(NULL);
1737 /* Servers get special command limits that depend on the user count */
1738 switch (Client_Type(c)) {
1740 maxcmd = (int)(Client_UserCount() / 5)
1741 + MAX_COMMANDS_SERVER_MIN;
1742 /* Allow servers to handle even more commands while peering
1743 * to speed up server login and network synchronisation. */
1744 if (Conn_LastPing(Idx) == 0)
1747 case CLIENT_SERVICE:
1748 maxcmd = MAX_COMMANDS_SERVICE; break;
1751 for (i=0; i < maxcmd; i++) {
1753 if (My_Connections[Idx].delaytime > starttime)
1756 /* Unpack compressed data, if compression is in use */
1757 if (Conn_OPTION_ISSET(&My_Connections[Idx], CONN_ZIP)) {
1758 /* When unzipping fails, Unzip_Buffer() shuts
1759 * down the connection itself */
1760 if (!Unzip_Buffer(Idx))
1765 if (0 == array_bytes(&My_Connections[Idx].rbuf))
1768 /* Make sure that the buffer is NULL terminated */
1769 if (!array_cat0_temporary(&My_Connections[Idx].rbuf)) {
1770 Conn_Close(Idx, NULL,
1771 "Can't allocate memory [Handle_Buffer]",
1776 /* RFC 2812, section "2.3 Messages", 5th paragraph:
1777 * "IRC messages are always lines of characters terminated
1778 * with a CR-LF (Carriage Return - Line Feed) pair [...]". */
1780 ptr = strstr(array_start(&My_Connections[Idx].rbuf), "\r\n");
1783 /* Check for non-RFC-compliant request (only CR or LF)?
1784 * Unfortunately, there are quite a few clients out there
1785 * that do this -- e. g. mIRC, BitchX, and Trillian :-( */
1786 ptr1 = strchr(array_start(&My_Connections[Idx].rbuf), '\r');
1787 ptr2 = strchr(array_start(&My_Connections[Idx].rbuf), '\n');
1789 /* Check if there is a single CR or LF _before_ the
1790 * corerct CR+LF line terminator: */
1791 first_eol = ptr1 < ptr2 ? ptr1 : ptr2;
1792 if (first_eol < ptr) {
1793 /* Single CR or LF before CR+LF found */
1797 } else if (ptr1 || ptr2) {
1798 /* No CR+LF terminated command found, but single
1799 * CR or LF found ... */
1801 ptr = ptr1 < ptr2 ? ptr1 : ptr2;
1803 ptr = ptr1 ? ptr1 : ptr2;
1811 /* Complete (=line terminated) request found, handle it! */
1814 len = ptr - (char *)array_start(&My_Connections[Idx].rbuf) + delta;
1816 if (len > (COMMAND_LEN - 1)) {
1817 /* Request must not exceed 512 chars (incl. CR+LF!),
1818 * see RFC 2812. Disconnect Client if this happens. */
1820 "Request too long (connection %d): %d bytes (max. %d expected)!",
1821 Idx, array_bytes(&My_Connections[Idx].rbuf),
1823 Conn_Close(Idx, NULL, "Request too long", true);
1827 len_processed += (unsigned int)len;
1829 /* Request is empty (only '\r\n', '\r' or '\n');
1830 * delta is 2 ('\r\n') or 1 ('\r' or '\n'), see above */
1831 array_moveleft(&My_Connections[Idx].rbuf, 1, len);
1835 /* remember if stream is already compressed */
1836 old_z = My_Connections[Idx].options & CONN_ZIP;
1839 My_Connections[Idx].msg_in++;
1841 (Idx, (char *)array_start(&My_Connections[Idx].rbuf)))
1842 return 0; /* error -> connection has been closed */
1844 array_moveleft(&My_Connections[Idx].rbuf, 1, len);
1846 LogDebug("Connection %d: %d bytes left in read buffer.",
1847 Idx, array_bytes(&My_Connections[Idx].rbuf));
1850 if ((!old_z) && (My_Connections[Idx].options & CONN_ZIP) &&
1851 (array_bytes(&My_Connections[Idx].rbuf) > 0)) {
1852 /* The last command activated socket compression.
1853 * Data that was read after that needs to be copied
1854 * to the unzip buffer for decompression: */
1856 (&My_Connections[Idx].zip.rbuf,
1857 &My_Connections[Idx].rbuf)) {
1858 Conn_Close(Idx, NULL,
1859 "Can't allocate memory [Handle_Buffer]",
1864 array_trunc(&My_Connections[Idx].rbuf);
1866 ("Moved already received data (%u bytes) to uncompression buffer.",
1867 array_bytes(&My_Connections[Idx].zip.rbuf));
1871 return len_processed;
1872 } /* Handle_Buffer */
1876 * Check whether established connections are still alive or not.
1877 * If not, play PING-PONG first; and if that doesn't help either,
1878 * disconnect the respective peer.
1881 Check_Connections(void)
1887 for (i = 0; i < Pool_Size; i++) {
1888 if (My_Connections[i].sock < 0)
1891 c = Conn_GetClient(i);
1892 if (c && ((Client_Type(c) == CLIENT_USER)
1893 || (Client_Type(c) == CLIENT_SERVER)
1894 || (Client_Type(c) == CLIENT_SERVICE))) {
1895 /* connected User, Server or Service */
1896 if (My_Connections[i].lastping >
1897 My_Connections[i].lastdata) {
1898 /* We already sent a ping */
1899 if (My_Connections[i].lastping <
1900 time(NULL) - Conf_PongTimeout) {
1902 snprintf(msg, sizeof(msg),
1903 "Ping timeout: %d seconds",
1905 LogDebug("Connection %d: %s.", i, msg);
1906 Conn_Close(i, NULL, msg, true);
1908 } else if (My_Connections[i].lastdata <
1909 time(NULL) - Conf_PingTimeout) {
1910 /* We need to send a PING ... */
1911 LogDebug("Connection %d: sending PING ...", i);
1913 Conn_WriteStr(i, "PING :%s",
1914 Client_ID(Client_ThisServer()));
1917 /* The connection is not fully established yet, so
1918 * we don't do the PING-PONG game here but instead
1919 * disconnect the client after "a short time" if it's
1920 * still not registered. */
1922 if (My_Connections[i].lastdata <
1923 time(NULL) - Conf_PongTimeout) {
1925 ("Unregistered connection %d timed out ...",
1927 Conn_Close(i, NULL, "Timeout", false);
1931 } /* Check_Connections */
1935 * Check if further server links should be established.
1943 time_now = time(NULL);
1945 /* Check all configured servers */
1946 for (i = 0; i < MAX_SERVERS; i++) {
1947 if (Conf_Server[i].conn_id != NONE)
1948 continue; /* Already establishing or connected */
1949 if (!Conf_Server[i].host[0] || !Conf_Server[i].port > 0)
1950 continue; /* No host and/or port configured */
1951 if (Conf_Server[i].flags & CONF_SFLAG_DISABLED)
1952 continue; /* Disabled configuration entry */
1953 if (Conf_Server[i].lasttry > (time_now - Conf_ConnectRetry))
1954 continue; /* We have to wait a little bit ... */
1956 /* Is there already a connection in this group? */
1957 if (Conf_Server[i].group > NONE) {
1958 for (n = 0; n < MAX_SERVERS; n++) {
1961 if ((Conf_Server[n].conn_id != NONE) &&
1962 (Conf_Server[n].group == Conf_Server[i].group))
1965 if (n < MAX_SERVERS)
1969 /* Okay, try to connect now */
1971 "Preparing to establish a new server link for \"%s\" ...",
1972 Conf_Server[i].name);
1973 Conf_Server[i].lasttry = time_now;
1974 Conf_Server[i].conn_id = SERVER_WAIT;
1975 assert(Proc_GetPipeFd(&Conf_Server[i].res_stat) < 0);
1976 Resolve_Name(&Conf_Server[i].res_stat, Conf_Server[i].host,
1977 cb_Connect_to_Server);
1979 } /* Check_Servers */
1983 * Establish a new outgoing server connection.
1985 * @param Server Configuration index of the server.
1986 * @param dest Destination IP address to connect to.
1989 New_Server( int Server , ng_ipaddr_t *dest)
1991 /* Establish new server link */
1992 char ip_str[NG_INET_ADDRSTRLEN];
1993 int af_dest, res, new_sock;
1996 assert( Server > NONE );
1998 /* Make sure that the remote server hasn't re-linked to this server
1999 * asynchronously on its own */
2000 if (Conf_Server[Server].conn_id > NONE) {
2002 "Connection to \"%s\" meanwhile re-established, aborting preparation.");
2006 if (!ng_ipaddr_tostr_r(dest, ip_str)) {
2007 Log(LOG_WARNING, "New_Server: Could not convert IP to string");
2011 af_dest = ng_ipaddr_af(dest);
2012 new_sock = socket(af_dest, SOCK_STREAM, 0);
2015 "Establishing connection for \"%s\" to \"%s:%d\" (%s), socket %d ...",
2016 Conf_Server[Server].name, Conf_Server[Server].host,
2017 Conf_Server[Server].port, ip_str, new_sock);
2020 Log(LOG_CRIT, "Can't create socket (af %d): %s!",
2021 af_dest, strerror(errno));
2025 if (!Init_Socket(new_sock))
2028 /* is a bind address configured? */
2029 res = ng_ipaddr_af(&Conf_Server[Server].bind_addr);
2030 /* if yes, bind now. If it fails, warn and let connect() pick a source address */
2031 if (res && bind(new_sock, (struct sockaddr *) &Conf_Server[Server].bind_addr,
2032 ng_ipaddr_salen(&Conf_Server[Server].bind_addr)))
2034 ng_ipaddr_tostr_r(&Conf_Server[Server].bind_addr, ip_str);
2035 Log(LOG_WARNING, "Can't bind socket to %s: %s!", ip_str, strerror(errno));
2037 ng_ipaddr_setport(dest, Conf_Server[Server].port);
2038 res = connect(new_sock, (struct sockaddr *) dest, ng_ipaddr_salen(dest));
2039 if(( res != 0 ) && ( errno != EINPROGRESS )) {
2040 Log( LOG_CRIT, "Can't connect socket: %s!", strerror( errno ));
2045 if (!array_alloc(&My_ConnArray, sizeof(CONNECTION), (size_t)new_sock)) {
2047 "Cannot allocate memory for server connection (socket %d)",
2053 if (!io_event_create( new_sock, IO_WANTWRITE, cb_connserver)) {
2054 Log(LOG_ALERT, "io_event_create(): could not add fd %d", strerror(errno));
2059 My_Connections = array_start(&My_ConnArray);
2061 assert(My_Connections[new_sock].sock <= 0);
2063 Init_Conn_Struct(new_sock);
2065 ng_ipaddr_tostr_r(dest, ip_str);
2066 c = Client_NewLocal(new_sock, ip_str, CLIENT_UNKNOWNSERVER, false);
2068 Log( LOG_ALERT, "Can't establish connection: can't create client structure!" );
2073 /* Conn_Close() decrements this counter again */
2074 Account_Connection();
2075 Client_SetIntroducer( c, c );
2076 Client_SetToken( c, TOKEN_OUTBOUND );
2078 /* Register connection */
2079 if (!Conf_SetServer(Server, new_sock))
2081 My_Connections[new_sock].sock = new_sock;
2082 My_Connections[new_sock].addr = *dest;
2083 My_Connections[new_sock].client = c;
2084 strlcpy( My_Connections[new_sock].host, Conf_Server[Server].host,
2085 sizeof(My_Connections[new_sock].host ));
2088 if (Conf_Server[Server].SSLConnect && !ConnSSL_PrepareConnect( &My_Connections[new_sock],
2089 &Conf_Server[Server] ))
2091 Log(LOG_ALERT, "Could not initialize SSL for outgoing connection");
2092 Conn_Close( new_sock, "Could not initialize SSL for outgoing connection", NULL, false );
2093 Init_Conn_Struct( new_sock );
2094 Conf_Server[Server].conn_id = NONE;
2098 LogDebug("Registered new connection %d on socket %d (%ld in total).",
2099 new_sock, My_Connections[new_sock].sock, NumConnections);
2100 Conn_OPTION_ADD( &My_Connections[new_sock], CONN_ISCONNECTING );
2105 * Initialize connection structure.
2107 * @param Idx Connection index.
2110 Init_Conn_Struct(CONN_ID Idx)
2112 time_t now = time(NULL);
2114 memset(&My_Connections[Idx], 0, sizeof(CONNECTION));
2115 My_Connections[Idx].sock = -1;
2116 My_Connections[Idx].signon = now;
2117 My_Connections[Idx].lastdata = now;
2118 My_Connections[Idx].lastprivmsg = now;
2119 Proc_InitStruct(&My_Connections[Idx].proc_stat);
2122 My_Connections[Idx].iconv_from = (iconv_t)(-1);
2123 My_Connections[Idx].iconv_to = (iconv_t)(-1);
2125 } /* Init_Conn_Struct */
2129 * Initialize options of a new socket.
2131 * For example, we try to set socket options SO_REUSEADDR and IPTOS_LOWDELAY.
2132 * The socket is automatically closed if a fatal error is encountered.
2134 * @param Sock Socket handle.
2135 * @returns false if socket was closed due to fatal error.
2138 Init_Socket( int Sock )
2142 if (!io_setnonblock(Sock)) {
2143 Log( LOG_CRIT, "Can't enable non-blocking mode for socket: %s!", strerror( errno ));
2148 /* Don't block this port after socket shutdown */
2150 if( setsockopt( Sock, SOL_SOCKET, SO_REUSEADDR, &value, (socklen_t)sizeof( value )) != 0 )
2152 Log( LOG_ERR, "Can't set socket option SO_REUSEADDR: %s!", strerror( errno ));
2153 /* ignore this error */
2156 /* Set type of service (TOS) */
2157 #if defined(IPPROTO_IP) && defined(IPTOS_LOWDELAY)
2158 value = IPTOS_LOWDELAY;
2159 if (setsockopt(Sock, IPPROTO_IP, IP_TOS, &value,
2160 (socklen_t) sizeof(value))) {
2161 LogDebug("Can't set socket option IP_TOS: %s!",
2163 /* ignore this error */
2165 LogDebug("IP_TOS on socket %d has been set to IPTOS_LOWDELAY.",
2174 * Read results of a resolver sub-process and try to initiate a new server
2177 * @param fd File descriptor of the pipe to the sub-process.
2178 * @param events (ignored IO specification)
2181 cb_Connect_to_Server(int fd, UNUSED short events)
2183 /* Read result of resolver sub-process from pipe and start connection */
2186 ng_ipaddr_t dest_addrs[4]; /* we can handle at most 3; but we read up to
2187 four so we can log the 'more than we can handle'
2188 condition. First result is tried immediately, rest
2189 is saved for later if needed. */
2191 LogDebug("Resolver: Got forward lookup callback on fd %d, events %d", fd, events);
2193 for (i=0; i < MAX_SERVERS; i++) {
2194 if (Proc_GetPipeFd(&Conf_Server[i].res_stat) == fd )
2198 if( i >= MAX_SERVERS) {
2199 /* Ops, no matching server found?! */
2201 LogDebug("Resolver: Got Forward Lookup callback for unknown server!?");
2205 /* Read result from pipe */
2206 len = Proc_Read(&Conf_Server[i].res_stat, dest_addrs, sizeof(dest_addrs));
2207 Proc_Close(&Conf_Server[i].res_stat);
2209 /* Error resolving hostname: reset server structure */
2210 Conf_Server[i].conn_id = NONE;
2214 assert((len % sizeof(ng_ipaddr_t)) == 0);
2216 LogDebug("Got result from resolver: %u structs (%u bytes).", len/sizeof(ng_ipaddr_t), len);
2218 memset(&Conf_Server[i].dst_addr, 0, sizeof(Conf_Server[i].dst_addr));
2219 if (len > sizeof(ng_ipaddr_t)) {
2220 /* more than one address for this hostname, remember them
2221 * in case first address is unreachable/not available */
2222 len -= sizeof(ng_ipaddr_t);
2223 if (len > sizeof(Conf_Server[i].dst_addr)) {
2224 len = sizeof(Conf_Server[i].dst_addr);
2226 "Notice: Resolver returned more IP Addresses for host than we can handle, additional addresses dropped.");
2228 memcpy(&Conf_Server[i].dst_addr, &dest_addrs[1], len);
2231 New_Server(i, dest_addrs);
2232 } /* cb_Read_Forward_Lookup */
2236 * Read results of a resolver sub-process from the pipe and update the
2237 * apropriate connection/client structure(s): hostname and/or IDENT user name.
2239 * @param r_fd File descriptor of the pipe to the sub-process.
2240 * @param events (ignored IO specification)
2243 cb_Read_Resolver_Result( int r_fd, UNUSED short events )
2250 char readbuf[HOST_LEN + 2 + CLIENT_USER_LEN];
2253 char readbuf[HOST_LEN + 1];
2256 LogDebug("Resolver: Got callback on fd %d, events %d", r_fd, events );
2257 i = Conn_GetFromProc(r_fd);
2259 /* Ops, none found? Probably the connection has already
2260 * been closed!? We'll ignore that ... */
2262 LogDebug("Resolver: Got callback for unknown connection!?");
2266 /* Read result from pipe */
2267 len = Proc_Read(&My_Connections[i].proc_stat, readbuf, sizeof readbuf -1);
2268 Proc_Close(&My_Connections[i].proc_stat);
2272 readbuf[len] = '\0';
2273 identptr = strchr(readbuf, '\n');
2274 assert(identptr != NULL);
2276 Log( LOG_CRIT, "Resolver: Got malformed result!");
2281 LogDebug("Got result from resolver: \"%s\" (%u bytes read).", readbuf, len);
2282 /* Okay, we got a complete result: this is a host name for outgoing
2283 * connections and a host name and IDENT user name (if enabled) for
2284 * incoming connections.*/
2285 assert ( My_Connections[i].sock >= 0 );
2286 /* Incoming connection. Search client ... */
2287 c = Conn_GetClient( i );
2288 assert( c != NULL );
2290 /* Only update client information of unregistered clients.
2291 * Note: user commands (e. g. WEBIRC) are always read _after_ reading
2292 * the resolver results, so we don't have to worry to override settings
2293 * from these commands here. */
2294 if(Client_Type(c) == CLIENT_UNKNOWN) {
2295 strlcpy(My_Connections[i].host, readbuf,
2296 sizeof(My_Connections[i].host));
2297 Client_SetHostname(c, readbuf);
2298 if (Conf_NoticeAuth)
2299 (void)Conn_WriteStr(i,
2300 "NOTICE AUTH :*** Found your hostname: %s",
2301 My_Connections[i].host);
2307 if ((*ptr < '0' || *ptr > '9') &&
2308 (*ptr < 'A' || *ptr > 'Z') &&
2309 (*ptr < 'a' || *ptr > 'z'))
2314 /* Erroneous IDENT reply */
2316 "Got invalid IDENT reply for connection %d! Ignored.",
2320 "IDENT lookup for connection %d: \"%s\".",
2322 Client_SetUser(c, identptr, true);
2324 if (Conf_NoticeAuth) {
2325 (void)Conn_WriteStr(i,
2326 "NOTICE AUTH :*** Got %sident response%s%s",
2327 *ptr ? "invalid " : "",
2329 *ptr ? "" : identptr);
2332 Log(LOG_INFO, "IDENT lookup for connection %d: no result.", i);
2333 if (Conf_NoticeAuth && Conf_Ident)
2334 (void)Conn_WriteStr(i,
2335 "NOTICE AUTH :*** No ident response");
2339 if (Conf_NoticeAuth)
2340 (void)Handle_Write(i);
2342 Class_HandleServerBans(c);
2345 else Log( LOG_DEBUG, "Resolver: discarding result for already registered connection %d.", i );
2347 } /* cb_Read_Resolver_Result */
2351 * Write a "simple" (error) message to a socket.
2353 * The message is sent without using the connection write buffers, without
2354 * compression/encryption, and even without any error reporting. It is
2355 * designed for error messages of e.g. New_Connection().
2357 * @param Sock Socket handle.
2358 * @param Msg Message string to send.
2361 Simple_Message(int Sock, const char *Msg)
2363 char buf[COMMAND_LEN];
2366 assert(Sock > NONE);
2367 assert(Msg != NULL);
2369 strlcpy(buf, Msg, sizeof buf - 2);
2370 len = strlcat(buf, "\r\n", sizeof buf);
2371 if (write(Sock, buf, len) < 0) {
2372 /* Because this function most probably got called to log
2373 * an error message, any write error is ignored here to
2374 * avoid an endless loop. But casting the result of write()
2375 * to "void" doesn't satisfy the GNU C code attribute
2376 * "warn_unused_result" which is used by some versions of
2377 * glibc (e.g. 2.11.1), therefore this silly error
2378 * "handling" code here :-( */
2381 } /* Simple_Error */
2385 * Get CLIENT structure that belongs to a local connection identified by its
2386 * index number. Each connection belongs to a client by definition, so it is
2387 * not required that the caller checks for NULL return values.
2389 * @param Idx Connection index number.
2390 * @returns Pointer to CLIENT structure.
2393 Conn_GetClient( CONN_ID Idx )
2398 c = array_get(&My_ConnArray, sizeof (CONNECTION), (size_t)Idx);
2400 return c ? c->client : NULL;
2404 * Get PROC_STAT sub-process structure of a connection.
2406 * @param Idx Connection index number.
2407 * @returns PROC_STAT structure.
2410 Conn_GetProcStat(CONN_ID Idx)
2415 c = array_get(&My_ConnArray, sizeof (CONNECTION), (size_t)Idx);
2417 return &c->proc_stat;
2418 } /* Conn_GetProcStat */
2422 * Get CONN_ID from file descriptor associated to a subprocess structure.
2424 * @param fd File descriptor.
2425 * @returns CONN_ID or NONE (-1).
2428 Conn_GetFromProc(int fd)
2433 for (i = 0; i < Pool_Size; i++) {
2434 if ((My_Connections[i].sock != NONE)
2435 && (Proc_GetPipeFd(&My_Connections[i].proc_stat) == fd))
2439 } /* Conn_GetFromProc */
2445 Conn_GetAuthPing(CONN_ID Idx)
2447 assert (Idx != NONE);
2448 return My_Connections[Idx].auth_ping;
2449 } /* Conn_GetAuthPing */
2452 Conn_SetAuthPing(CONN_ID Idx, long ID)
2454 assert (Idx != NONE);
2455 My_Connections[Idx].auth_ping = ID;
2456 } /* Conn_SetAuthPing */
2464 * Get information about used SSL chiper.
2466 * @param Idx Connection index number.
2467 * @param buf Buffer for returned information text.
2468 * @param len Size of return buffer "buf".
2469 * @returns true on success, false otherwise.
2472 Conn_GetCipherInfo(CONN_ID Idx, char *buf, size_t len)
2476 assert(Idx < (int) array_length(&My_ConnArray, sizeof(CONNECTION)));
2477 return ConnSSL_GetCipherInfo(&My_Connections[Idx], buf, len);
2482 * Check if a connection is SSL-enabled or not.
2484 * @param Idx Connection index number.
2485 * @return true if connection is SSL-enabled, false otherwise.
2488 Conn_UsesSSL(CONN_ID Idx)
2492 assert(Idx < (int) array_length(&My_ConnArray, sizeof(CONNECTION)));
2493 return Conn_OPTION_ISSET(&My_Connections[Idx], CONN_SSL);
2502 * Dump internal state of the "connection module".
2505 Conn_DebugDump(void)
2509 Log(LOG_DEBUG, "Connection status:");
2510 for (i = 0; i < Pool_Size; i++) {
2511 if (My_Connections[i].sock == NONE)
2514 " - %d: host=%s, lastdata=%ld, lastping=%ld, delaytime=%ld, flag=%d, options=%d, bps=%d, client=%s",
2515 My_Connections[i].sock, My_Connections[i].host,
2516 My_Connections[i].lastdata, My_Connections[i].lastping,
2517 My_Connections[i].delaytime, My_Connections[i].flag,
2518 My_Connections[i].options, My_Connections[i].bps,
2519 My_Connections[i].client ? Client_ID(My_Connections[i].client) : "-");
2521 } /* Conn_DumpClients */