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 Init_Listeners(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 )) {
474 "io_event_create(): Can't add fd %d (port %u): %s!",
475 fd, (unsigned int) *port, strerror(errno));
488 * Initialize all listening sockets.
490 * @returns Number of created listening sockets
493 Conn_InitListeners( void )
495 /* Initialize ports on which the server should accept connections */
496 unsigned int created = 0;
497 char *copy, *listen_addr;
499 assert(Conf_ListenAddress);
501 /* can't use Conf_ListenAddress directly, see below */
502 copy = strdup(Conf_ListenAddress);
504 Log(LOG_CRIT, "Cannot copy %s: %s", Conf_ListenAddress,
508 listen_addr = strtok(copy, ",");
510 while (listen_addr) {
511 ngt_TrimStr(listen_addr);
513 created += Init_Listeners(&Conf_ListenPorts,
514 listen_addr, cb_listen);
516 created += Init_Listeners(&Conf_SSLOptions.ListenPorts,
517 listen_addr, cb_listen_ssl);
521 listen_addr = strtok(NULL, ",");
524 /* Can't free() Conf_ListenAddress here: on REHASH, if the config file
525 * cannot be re-loaded, we'd end up with a NULL Conf_ListenAddress.
526 * Instead, free() takes place in conf.c, before the config file
527 * is being parsed. */
531 } /* Conn_InitListeners */
535 * Shut down all listening sockets.
538 Conn_ExitListeners( void )
540 /* Close down all listening sockets */
544 arraylen = array_length(&My_Listeners, sizeof (int));
546 "Shutting down all listening sockets (%d total) ...", arraylen);
547 fd = array_start(&My_Listeners);
552 LogDebug("Listening socket %d closed.", *fd );
555 array_free(&My_Listeners);
556 } /* Conn_ExitListeners */
560 * Bind a socket to a specific (source) address.
562 * @param addr Address structure.
563 * @param listen_addrstr Source address as string.
564 * @param Port Port number.
565 * @returns true on success, false otherwise.
568 InitSinaddrListenAddr(ng_ipaddr_t *addr, const char *listen_addrstr, UINT16 Port)
572 ret = ng_ipaddr_init(addr, listen_addrstr, Port);
574 assert(listen_addrstr);
575 Log(LOG_CRIT, "Can't bind to [%s]:%u: can't convert ip address \"%s\"!",
576 listen_addrstr, Port, listen_addrstr);
583 * Set a socket to "IPv6 only". If the given socket doesn't belong to the
584 * AF_INET6 family, or the operating system doesn't support this functionality,
585 * this function retruns silently.
587 * @param af Address family of the socket.
588 * @param sock Socket handle.
591 set_v6_only(int af, int sock)
593 #if defined(IPV6_V6ONLY) && defined(WANT_IPV6)
599 if (setsockopt(sock, IPPROTO_IPV6, IPV6_V6ONLY, &on, (socklen_t)sizeof(on)))
600 Log(LOG_ERR, "Could not set IPV6_V6ONLY: %s", strerror(errno));
609 * Initialize new listening port.
611 * @param listen_addr Local address to bind the socet to (can be 0.0.0.0).
612 * @param Port Port number on which the new socket should be listening.
613 * @returns file descriptor of the socket or -1 on failure.
616 NewListener(const char *listen_addr, UINT16 Port)
618 /* Create new listening socket on specified port */
622 if (!InitSinaddrListenAddr(&addr, listen_addr, Port))
625 af = ng_ipaddr_af(&addr);
626 sock = socket(af, SOCK_STREAM, 0);
628 Log(LOG_CRIT, "Can't create socket (af %d) : %s!", af,
633 set_v6_only(af, sock);
635 if (!Init_Socket(sock))
638 if (bind(sock, (struct sockaddr *)&addr, ng_ipaddr_salen(&addr)) != 0) {
639 Log(LOG_CRIT, "Can't bind socket to address %s:%d - %s!",
640 ng_ipaddr_tostr(&addr), Port, strerror(errno));
645 if (listen(sock, 10) != 0) {
646 Log(LOG_CRIT, "Can't listen on socket: %s!", strerror(errno));
651 /* keep fd in list so we can close it when ngircd restarts/shuts down */
652 if (!array_catb(&My_Listeners, (char *)&sock, sizeof(int))) {
653 Log(LOG_CRIT, "Can't add socket to My_Listeners array: %s!",
659 Log(LOG_INFO, "Now listening on [%s]:%d (socket %d).",
660 ng_ipaddr_tostr(&addr), Port, sock);
668 * Check if SSL library needs to read SSL-protocol related data.
670 * SSL/TLS connections require extra treatment:
671 * When either CONN_SSL_WANT_WRITE or CONN_SSL_WANT_READ is set, we
672 * need to take care of that first, before checking read/write buffers.
673 * For instance, while we might have data in our write buffer, the
674 * TLS/SSL protocol might need to read internal data first for TLS/SSL
677 * If this function returns true, such a condition is met and we have
678 * to reverse the condition (check for read even if we've data to write,
679 * do not check for read but writeability even if write-buffer is empty).
681 * @param c Connection to check.
682 * @returns true if SSL-library has to read protocol data.
685 SSL_WantRead(const CONNECTION *c)
687 if (Conn_OPTION_ISSET(c, CONN_SSL_WANT_READ)) {
688 io_event_add(c->sock, IO_WANTREAD);
695 * Check if SSL library needs to write SSL-protocol related data.
697 * Please see description of SSL_WantRead() for full description!
699 * @param c Connection to check.
700 * @returns true if SSL-library has to write protocol data.
703 SSL_WantWrite(const CONNECTION *c)
705 if (Conn_OPTION_ISSET(c, CONN_SSL_WANT_WRITE)) {
706 io_event_add(c->sock, IO_WANTWRITE);
715 SSL_WantRead(UNUSED const CONNECTION *c)
719 SSL_WantWrite(UNUSED const CONNECTION *c)
726 * "Main Loop": Loop until shutdown or restart is signalled.
728 * This function loops until a shutdown or restart of ngIRCd is signalled and
729 * calls io_dispatch() to check for readable and writable sockets every second.
730 * It checks for status changes on pending connections (e. g. when a hostname
731 * has been resolved), checks for "penalties" and timeouts, and handles the
738 unsigned int wdatalen, bytes_processed;
742 while (!NGIRCd_SignalQuit && !NGIRCd_SignalRestart) {
745 /* Check configured servers and established links */
749 /* Expire outdated class/list items */
752 /* Look for non-empty read buffers ... */
753 for (i = 0; i < Pool_Size; i++) {
754 if ((My_Connections[i].sock > NONE)
755 && (array_bytes(&My_Connections[i].rbuf) > 0)
756 && (My_Connections[i].delaytime <= t)) {
757 /* ... and try to handle the received data */
758 bytes_processed = Handle_Buffer(i);
759 /* if we processed data, and there might be
760 * more commands in the input buffer, do not
761 * try to read any more data now */
762 if (bytes_processed &&
763 array_bytes(&My_Connections[i].rbuf) > 2) {
765 ("Throttling connection %d: command limit reached!",
767 Conn_SetPenalty(i, 1);
772 /* Look for non-empty write buffers ... */
773 for (i = 0; i < Pool_Size; i++) {
774 if (My_Connections[i].sock <= NONE)
777 wdatalen = (unsigned int)array_bytes(&My_Connections[i].wbuf);
780 array_bytes(&My_Connections[i].zip.wbuf) > 0)
785 if (SSL_WantRead(&My_Connections[i]))
787 io_event_add(My_Connections[i].sock,
792 /* Check from which sockets we possibly could read ... */
793 for (i = 0; i < Pool_Size; i++) {
794 if (My_Connections[i].sock <= NONE)
797 if (SSL_WantWrite(&My_Connections[i]))
798 continue; /* TLS/SSL layer needs to write data; deal with this first */
800 if (Proc_InProgress(&My_Connections[i].proc_stat)) {
801 /* Wait for completion of forked subprocess
802 * and ignore the socket in the meantime ... */
803 io_event_del(My_Connections[i].sock,
808 if (Conn_OPTION_ISSET(&My_Connections[i], CONN_ISCONNECTING))
809 /* Wait for completion of connect() ... */
812 if (My_Connections[i].delaytime > t) {
813 /* There is a "penalty time" set: ignore socket! */
814 io_event_del(My_Connections[i].sock,
819 io_event_add(My_Connections[i].sock, IO_WANTREAD);
822 /* Set the timeout for reading from the network to 1 second,
823 * which is the granularity with witch we handle "penalty
824 * times" for example.
825 * Note: tv_sec/usec are undefined(!) after io_dispatch()
826 * returns, so we have to set it beforce each call to it! */
830 /* Wait for activity ... */
831 i = io_dispatch(&tv);
832 if (i == -1 && errno != EINTR) {
833 Log(LOG_EMERG, "Conn_Handler(): io_dispatch(): %s!",
835 Log(LOG_ALERT, "%s exiting due to fatal errors!",
841 if (NGIRCd_SignalQuit)
842 Log(LOG_NOTICE | LOG_snotice, "Server going down NOW!");
843 else if (NGIRCd_SignalRestart)
844 Log(LOG_NOTICE | LOG_snotice, "Server restarting NOW!");
849 * Write a text string into the socket of a connection.
851 * This function automatically appends CR+LF to the string and validates that
852 * the result is a valid IRC message (oversized messages are shortened, for
853 * example). Then it calls the Conn_Write() function to do the actual sending.
855 * @param Idx Index fo the connection.
856 * @param Format Format string, see printf().
857 * @returns true on success, false otherwise.
861 Conn_WriteStr(CONN_ID Idx, const char *Format, ...)
864 Conn_WriteStr(Idx, Format, va_alist)
870 char buffer[COMMAND_LEN];
878 assert( Idx > NONE );
879 assert( Format != NULL );
882 va_start( ap, Format );
886 if (vsnprintf( buffer, COMMAND_LEN - 2, Format, ap ) >= COMMAND_LEN - 2 ) {
888 * The string that should be written to the socket is longer
889 * than the allowed size of COMMAND_LEN bytes (including both
890 * the CR and LF characters). This can be caused by the
891 * IRC_WriteXXX() functions when the prefix of this server had
892 * to be added to an already "quite long" command line which
893 * has been received from a regular IRC client, for example.
895 * We are not allowed to send such "oversized" messages to
896 * other servers and clients, see RFC 2812 2.3 and 2813 3.3
897 * ("these messages SHALL NOT exceed 512 characters in length,
898 * counting all characters including the trailing CR-LF").
900 * So we have a big problem here: we should send more bytes
901 * to the network than we are allowed to and we don't know
902 * the originator (any more). The "old" behaviour of blaming
903 * the receiver ("next hop") is a bad idea (it could be just
904 * an other server only routing the message!), so the only
905 * option left is to shorten the string and to hope that the
906 * result is still somewhat useful ...
910 strcpy (buffer + sizeof(buffer) - strlen(CUT_TXTSUFFIX) - 2 - 1,
915 ptr = strchr(buffer + 1, ':');
918 message = Conn_EncodingTo(Idx, ptr);
920 strlcpy(ptr, message, sizeof(buffer) - (ptr - buffer));
926 Log(LOG_DEBUG, " -> connection %d: '%s'.", Idx, buffer);
929 len = strlcat( buffer, "\r\n", sizeof( buffer ));
930 ok = Conn_Write(Idx, buffer, len);
931 My_Connections[Idx].msg_out++;
935 } /* Conn_WriteStr */
938 Conn_Password( CONN_ID Idx )
940 assert( Idx > NONE );
941 if (My_Connections[Idx].pwd == NULL)
944 return My_Connections[Idx].pwd;
945 } /* Conn_Password */
948 Conn_SetPassword( CONN_ID Idx, const char *Pwd )
950 assert( Idx > NONE );
952 if (My_Connections[Idx].pwd)
953 free(My_Connections[Idx].pwd);
955 My_Connections[Idx].pwd = strdup(Pwd);
956 if (My_Connections[Idx].pwd == NULL) {
957 Log(LOG_EMERG, "Can't allocate memory! [Conn_SetPassword]");
960 } /* Conn_SetPassword */
963 * Append Data to the outbound write buffer of a connection.
965 * @param Idx Index of the connection.
966 * @param Data pointer to the data.
967 * @param Len length of Data.
968 * @returns true on success, false otherwise.
971 Conn_Write( CONN_ID Idx, char *Data, size_t Len )
974 size_t writebuf_limit = WRITEBUFFER_MAX_LEN;
975 assert( Idx > NONE );
976 assert( Data != NULL );
979 /* Is the socket still open? A previous call to Conn_Write()
980 * may have closed the connection due to a fatal error.
981 * In this case it is sufficient to return an error, as well. */
982 if (My_Connections[Idx].sock <= NONE) {
983 LogDebug("Skipped write on closed socket (connection %d).", Idx);
987 /* Make sure that there still exists a CLIENT structure associated
988 * with this connection and check if this is a server or not: */
989 c = Conn_GetClient(Idx);
991 /* Servers do get special write buffer limits, so they can
992 * generate all the messages that are required while peering. */
993 if (Client_Type(c) == CLIENT_SERVER)
994 writebuf_limit = WRITEBUFFER_SLINK_LEN;
996 LogDebug("Write on socket without client (connection %d)!?", Idx);
999 if ( Conn_OPTION_ISSET( &My_Connections[Idx], CONN_ZIP )) {
1001 * Zip_Buffer() does all the dirty work for us: it flushes
1002 * the (pre-)compression buffers if required and handles
1003 * all error conditions. */
1004 if (!Zip_Buffer(Idx, Data, Len))
1010 /* Uncompressed link:
1011 * Check if outbound buffer has enough space for the data. */
1012 if (array_bytes(&My_Connections[Idx].wbuf) + Len >=
1013 WRITEBUFFER_FLUSH_LEN) {
1014 /* Buffer is full, flush it. Handle_Write deals with
1015 * low-level errors, if any. */
1016 if (!Handle_Write(Idx))
1020 /* When the write buffer is still too big after flushing it,
1021 * the connection will be killed. */
1022 if (array_bytes(&My_Connections[Idx].wbuf) + Len >=
1025 "Write buffer space exhausted (connection %d, limit is %lu bytes, %lu bytes new, %lu bytes pending)",
1026 Idx, writebuf_limit, Len,
1027 (unsigned long)array_bytes(&My_Connections[Idx].wbuf));
1028 Conn_Close(Idx, "Write buffer space exhausted", NULL, false);
1032 /* Copy data to write buffer */
1033 if (!array_catb(&My_Connections[Idx].wbuf, Data, Len))
1036 My_Connections[Idx].bytes_out += Len;
1039 /* Adjust global write counter */
1047 * Shut down a connection.
1049 * @param Idx Connection index.
1050 * @param LogMsg Message to write to the log or NULL. If no LogMsg
1051 * is given, the FwdMsg is logged.
1052 * @param FwdMsg Message to forward to remote servers.
1053 * @param InformClient If true, inform the client on the connection which is
1054 * to be shut down of the reason (FwdMsg) and send
1055 * connection statistics before disconnecting it.
1058 Conn_Close( CONN_ID Idx, const char *LogMsg, const char *FwdMsg, bool InformClient )
1060 /* Close connection. Open pipes of asynchronous resolver
1061 * sub-processes are closed down. */
1067 double in_z_k, out_z_k;
1071 assert( Idx > NONE );
1073 /* Is this link already shutting down? */
1074 if( Conn_OPTION_ISSET( &My_Connections[Idx], CONN_ISCLOSING )) {
1075 /* Conn_Close() has been called recursively for this link;
1076 * probabe reason: Handle_Write() failed -- see below. */
1077 LogDebug("Recursive request to close connection: %d", Idx );
1081 assert( My_Connections[Idx].sock > NONE );
1083 /* Mark link as "closing" */
1084 Conn_OPTION_ADD( &My_Connections[Idx], CONN_ISCLOSING );
1086 port = ng_ipaddr_getport(&My_Connections[Idx].addr);
1087 Log(LOG_INFO, "Shutting down connection %d (%s) with \"%s:%d\" ...", Idx,
1088 LogMsg ? LogMsg : FwdMsg, My_Connections[Idx].host, port);
1090 /* Search client, if any */
1091 c = Conn_GetClient( Idx );
1093 /* Should the client be informed? */
1096 /* Send statistics to client if registered as user: */
1097 if ((c != NULL) && (Client_Type(c) == CLIENT_USER)) {
1099 ":%s NOTICE %s :%sConnection statistics: client %.1f kb, server %.1f kb.",
1100 Client_ID(Client_ThisServer()), Client_ID(c),
1102 (double)My_Connections[Idx].bytes_in / 1024,
1103 (double)My_Connections[Idx].bytes_out / 1024);
1106 /* Send ERROR to client (see RFC 2812, section 3.1.7) */
1108 Conn_WriteStr(Idx, "ERROR :%s", FwdMsg);
1110 Conn_WriteStr(Idx, "ERROR :Closing connection");
1113 /* Try to write out the write buffer. Note: Handle_Write() eventually
1114 * removes the CLIENT structure associated with this connection if an
1115 * error occurs! So we have to re-check if there is still an valid
1116 * CLIENT structure after calling Handle_Write() ...*/
1117 (void)Handle_Write( Idx );
1119 /* Search client, if any (re-check!) */
1120 c = Conn_GetClient( Idx );
1122 if ( Conn_OPTION_ISSET( &My_Connections[Idx], CONN_SSL )) {
1123 Log(LOG_INFO, "SSL connection %d shutting down ...", Idx);
1124 ConnSSL_Free(&My_Connections[Idx]);
1127 /* Shut down socket */
1128 if (! io_close(My_Connections[Idx].sock)) {
1129 /* Oops, we can't close the socket!? This is ... ugly! */
1131 "Error closing connection %d (socket %d) with %s:%d - %s! (ignored)",
1132 Idx, My_Connections[Idx].sock, My_Connections[Idx].host,
1133 port, strerror(errno));
1136 /* Mark socket as invalid: */
1137 My_Connections[Idx].sock = NONE;
1139 /* If there is still a client, unregister it now */
1141 Client_Destroy(c, LogMsg, FwdMsg, true);
1143 /* Calculate statistics and log information */
1144 in_k = (double)My_Connections[Idx].bytes_in / 1024;
1145 out_k = (double)My_Connections[Idx].bytes_out / 1024;
1147 if (Conn_OPTION_ISSET( &My_Connections[Idx], CONN_ZIP)) {
1148 in_z_k = (double)My_Connections[Idx].zip.bytes_in / 1024;
1149 out_z_k = (double)My_Connections[Idx].zip.bytes_out / 1024;
1150 /* Make sure that no division by zero can occur during
1151 * the calculation of in_p and out_p: in_z_k and out_z_k
1152 * are non-zero, that's guaranteed by the protocol until
1153 * compression can be enabled. */
1158 in_p = (int)(( in_k * 100 ) / in_z_k );
1159 out_p = (int)(( out_k * 100 ) / out_z_k );
1161 "Connection %d with \"%s:%d\" closed (in: %.1fk/%.1fk/%d%%, out: %.1fk/%.1fk/%d%%).",
1162 Idx, My_Connections[Idx].host, port,
1163 in_k, in_z_k, in_p, out_k, out_z_k, out_p);
1169 "Connection %d with \"%s:%d\" closed (in: %.1fk, out: %.1fk).",
1170 Idx, My_Connections[Idx].host, port,
1174 /* Servers: Modify time of next connect attempt? */
1175 Conf_UnsetServer( Idx );
1178 /* Clean up zlib, if link was compressed */
1179 if ( Conn_OPTION_ISSET( &My_Connections[Idx], CONN_ZIP )) {
1180 inflateEnd( &My_Connections[Idx].zip.in );
1181 deflateEnd( &My_Connections[Idx].zip.out );
1182 array_free(&My_Connections[Idx].zip.rbuf);
1183 array_free(&My_Connections[Idx].zip.wbuf);
1187 array_free(&My_Connections[Idx].rbuf);
1188 array_free(&My_Connections[Idx].wbuf);
1189 if (My_Connections[Idx].pwd != NULL)
1190 free(My_Connections[Idx].pwd);
1192 /* Clean up connection structure (=free it) */
1193 Init_Conn_Struct( Idx );
1195 assert(NumConnections > 0);
1198 LogDebug("Shutdown of connection %d completed, %ld connection%s left.",
1199 Idx, NumConnections, NumConnections != 1 ? "s" : "");
1204 * Get current number of connections.
1206 * @returns Number of current connections.
1211 return NumConnections;
1216 * Get number of maximum simultaneous connections.
1218 * @returns Number of maximum simultaneous connections.
1223 return NumConnectionsMax;
1224 } /* Conn_CountMax */
1228 * Get number of connections accepted since the daemon startet.
1230 * @returns Number of connections accepted.
1233 Conn_CountAccepted(void)
1235 return NumConnectionsAccepted;
1236 } /* Conn_CountAccepted */
1240 * Synchronize established connections and configured server structures
1241 * after a configuration update and store the correct connection IDs, if any.
1244 Conn_SyncServerStruct(void)
1250 for (i = 0; i < Pool_Size; i++) {
1251 if (My_Connections[i].sock == NONE)
1255 client = Conn_GetClient(i);
1256 if (!client || Client_Type(client) != CLIENT_SERVER)
1259 for (c = 0; c < MAX_SERVERS; c++) {
1260 /* Configured server? */
1261 if (!Conf_Server[c].host[0])
1264 if (strcasecmp(Conf_Server[c].name, Client_ID(client)) == 0)
1265 Conf_Server[c].conn_id = i;
1268 } /* SyncServerStruct */
1272 * Get IP address string of a connection.
1274 * @param Idx Connection index.
1275 * @return Pointer to a global buffer containing the IP address as string.
1278 Conn_GetIPAInfo(CONN_ID Idx)
1281 return ng_ipaddr_tostr(&My_Connections[Idx].addr);
1286 * Send out data of write buffer; connect new sockets.
1288 * @param Idx Connection index.
1289 * @returns true on success, false otherwise.
1292 Handle_Write( CONN_ID Idx )
1297 assert( Idx > NONE );
1298 if ( My_Connections[Idx].sock < 0 ) {
1299 LogDebug("Handle_Write() on closed socket, connection %d", Idx);
1302 assert( My_Connections[Idx].sock > NONE );
1304 wdatalen = array_bytes(&My_Connections[Idx].wbuf );
1307 if (wdatalen == 0) {
1308 /* Write buffer is empty, so we try to flush the compression
1309 * buffer and get some data to work with from there :-) */
1310 if (!Zip_Flush(Idx))
1313 /* Now the write buffer most probably has changed: */
1314 wdatalen = array_bytes(&My_Connections[Idx].wbuf);
1318 if (wdatalen == 0) {
1319 /* Still no data, fine. */
1320 io_event_del(My_Connections[Idx].sock, IO_WANTWRITE );
1326 ("Handle_Write() called for connection %d, %ld bytes pending ...",
1331 if ( Conn_OPTION_ISSET( &My_Connections[Idx], CONN_SSL )) {
1332 len = ConnSSL_Write(&My_Connections[Idx], array_start(&My_Connections[Idx].wbuf), wdatalen);
1336 len = write(My_Connections[Idx].sock,
1337 array_start(&My_Connections[Idx].wbuf), wdatalen );
1340 if (errno == EAGAIN || errno == EINTR)
1343 Log(LOG_ERR, "Write error on connection %d (socket %d): %s!",
1344 Idx, My_Connections[Idx].sock, strerror(errno));
1345 Conn_Close(Idx, "Write error!", NULL, false);
1349 /* move any data not yet written to beginning */
1350 array_moveleft(&My_Connections[Idx].wbuf, 1, (size_t)len);
1353 } /* Handle_Write */
1357 * Count established connections to a specific IP address.
1359 * @returns Number of established connections.
1362 Count_Connections(ng_ipaddr_t *a)
1367 for (i = 0; i < Pool_Size; i++) {
1368 if (My_Connections[i].sock <= NONE)
1370 if (ng_ipaddr_ipequal(&My_Connections[i].addr, a))
1374 } /* Count_Connections */
1378 * Initialize new client connection on a listening socket.
1380 * @param Sock Listening socket descriptor.
1381 * @param IsSSL true if this socket expects SSL-encrypted data.
1382 * @returns Accepted socket descriptor or -1 on error.
1385 New_Connection(int Sock, UNUSED bool IsSSL)
1388 struct request_info req;
1390 ng_ipaddr_t new_addr;
1391 char ip_str[NG_INET_ADDRSTRLEN];
1392 int new_sock, new_sock_len;
1396 assert(Sock > NONE);
1398 LogDebug("Accepting new connection on socket %d ...", Sock);
1400 new_sock_len = (int)sizeof(new_addr);
1401 new_sock = accept(Sock, (struct sockaddr *)&new_addr,
1402 (socklen_t *)&new_sock_len);
1404 Log(LOG_CRIT, "Can't accept connection: %s!", strerror(errno));
1407 NumConnectionsAccepted++;
1409 if (!ng_ipaddr_tostr_r(&new_addr, ip_str)) {
1410 Log(LOG_CRIT, "fd %d: Can't convert IP address!", new_sock);
1411 Simple_Message(new_sock, "ERROR :Internal Server Error");
1417 /* Validate socket using TCP Wrappers */
1418 request_init(&req, RQ_DAEMON, PACKAGE_NAME, RQ_FILE, new_sock,
1419 RQ_CLIENT_SIN, &new_addr, NULL);
1421 if (!hosts_access(&req)) {
1423 "Refused connection from %s (by TCP Wrappers)!", ip_str);
1424 Simple_Message(new_sock, "ERROR :Connection refused");
1430 if (!Init_Socket(new_sock))
1433 /* Check global connection limit */
1434 if ((Conf_MaxConnections > 0) &&
1435 (NumConnections >= (size_t) Conf_MaxConnections)) {
1436 Log(LOG_ALERT, "Can't accept connection: limit (%d) reached!",
1437 Conf_MaxConnections);
1438 Simple_Message(new_sock, "ERROR :Connection limit reached");
1443 /* Check IP-based connection limit */
1444 cnt = Count_Connections(&new_addr);
1445 if ((Conf_MaxConnectionsIP > 0) && (cnt >= Conf_MaxConnectionsIP)) {
1446 /* Access denied, too many connections from this IP address! */
1448 "Refused connection from %s: too may connections (%ld) from this IP address!",
1450 Simple_Message(new_sock,
1451 "ERROR :Connection refused, too many connections from your IP address");
1456 if (new_sock >= Pool_Size) {
1457 if (!array_alloc(&My_ConnArray, sizeof(CONNECTION),
1458 (size_t) new_sock)) {
1460 "Can't allocate memory! [New_Connection]");
1461 Simple_Message(new_sock, "ERROR: Internal error");
1465 LogDebug("Bumped connection pool to %ld items (internal: %ld items, %ld bytes)",
1466 new_sock, array_length(&My_ConnArray,
1467 sizeof(CONNECTION)), array_bytes(&My_ConnArray));
1469 /* Adjust pointer to new block */
1470 My_Connections = array_start(&My_ConnArray);
1471 while (Pool_Size <= new_sock)
1472 Init_Conn_Struct(Pool_Size++);
1475 /* register callback */
1476 if (!io_event_create(new_sock, IO_WANTREAD, cb_clientserver)) {
1478 "Can't accept connection: io_event_create failed!");
1479 Simple_Message(new_sock, "ERROR :Internal error");
1484 c = Client_NewLocal(new_sock, NULL, CLIENT_UNKNOWN, false);
1487 "Can't accept connection: can't create client structure!");
1488 Simple_Message(new_sock, "ERROR :Internal error");
1493 Init_Conn_Struct(new_sock);
1494 My_Connections[new_sock].sock = new_sock;
1495 My_Connections[new_sock].addr = new_addr;
1496 My_Connections[new_sock].client = c;
1498 /* Set initial hostname to IP address. This becomes overwritten when
1499 * the DNS lookup is enabled and succeeds, but is used otherwise. */
1500 if (ng_ipaddr_af(&new_addr) != AF_INET)
1501 snprintf(My_Connections[new_sock].host,
1502 sizeof(My_Connections[new_sock].host), "[%s]", ip_str);
1504 strlcpy(My_Connections[new_sock].host, ip_str,
1505 sizeof(My_Connections[new_sock].host));
1507 Client_SetHostname(c, My_Connections[new_sock].host);
1509 Log(LOG_INFO, "Accepted connection %d from \"%s:%d\" on socket %d.",
1510 new_sock, My_Connections[new_sock].host,
1511 ng_ipaddr_getport(&new_addr), Sock);
1512 Account_Connection();
1515 /* Delay connection initalization until SSL handshake is finished */
1518 Conn_StartLogin(new_sock);
1521 } /* New_Connection */
1525 * Finish connection initialization, start resolver subprocess.
1527 * @param Idx Connection index.
1530 Conn_StartLogin(CONN_ID Idx)
1532 int ident_sock = -1;
1536 /* Nothing to do if DNS (and resolver subprocess) is disabled */
1541 /* Should we make an IDENT request? */
1543 ident_sock = My_Connections[Idx].sock;
1546 if (Conf_NoticeAuth) {
1547 /* Send "NOTICE AUTH" messages to the client */
1550 (void)Conn_WriteStr(Idx,
1551 "NOTICE AUTH :*** Looking up your hostname and checking ident");
1554 (void)Conn_WriteStr(Idx,
1555 "NOTICE AUTH :*** Looking up your hostname");
1556 (void)Handle_Write(Idx);
1559 Resolve_Addr(&My_Connections[Idx].proc_stat, &My_Connections[Idx].addr,
1560 ident_sock, cb_Read_Resolver_Result);
1565 * Update global connection counters.
1568 Account_Connection(void)
1571 if (NumConnections > NumConnectionsMax)
1572 NumConnectionsMax = NumConnections;
1573 LogDebug("Total number of connections now %lu (max %lu).",
1574 NumConnections, NumConnectionsMax);
1575 } /* Account_Connection */
1579 * Translate socket handle into connection index.
1581 * @param Sock Socket handle.
1582 * @returns Connecion index or NONE, if no connection could be found.
1585 Socket2Index( int Sock )
1587 assert( Sock >= 0 );
1589 if( Sock >= Pool_Size || My_Connections[Sock].sock != Sock ) {
1590 /* the Connection was already closed again, likely due to
1592 LogDebug("Socket2Index: can't get connection for socket %d!", Sock);
1596 } /* Socket2Index */
1600 * Read data from the network to the read buffer. If an error occures,
1601 * the socket of this connection will be shut down.
1603 * @param Idx Connection index.
1606 Read_Request( CONN_ID Idx )
1609 static const unsigned int maxbps = COMMAND_LEN / 2;
1610 char readbuf[READBUFFER_LEN];
1613 assert( Idx > NONE );
1614 assert( My_Connections[Idx].sock > NONE );
1617 if ((array_bytes(&My_Connections[Idx].rbuf) >= READBUFFER_LEN) ||
1618 (array_bytes(&My_Connections[Idx].zip.rbuf) >= READBUFFER_LEN))
1620 if (array_bytes(&My_Connections[Idx].rbuf) >= READBUFFER_LEN)
1623 /* Read buffer is full */
1625 "Receive buffer space exhausted (connection %d): %d bytes",
1626 Idx, array_bytes(&My_Connections[Idx].rbuf));
1627 Conn_Close(Idx, "Receive buffer space exhausted", NULL, false);
1632 if (Conn_OPTION_ISSET(&My_Connections[Idx], CONN_SSL))
1633 len = ConnSSL_Read( &My_Connections[Idx], readbuf, sizeof(readbuf));
1636 len = read(My_Connections[Idx].sock, readbuf, sizeof(readbuf));
1638 LogDebug("Client \"%s:%u\" is closing connection %d ...",
1639 My_Connections[Idx].host,
1640 ng_ipaddr_tostr(&My_Connections[Idx].addr), Idx);
1641 Conn_Close(Idx, NULL, "Client closed connection", false);
1646 if( errno == EAGAIN ) return;
1647 Log(LOG_ERR, "Read error on connection %d (socket %d): %s!",
1648 Idx, My_Connections[Idx].sock, strerror(errno));
1649 Conn_Close(Idx, "Read error", "Client closed connection",
1654 if (Conn_OPTION_ISSET(&My_Connections[Idx], CONN_ZIP)) {
1655 if (!array_catb(&My_Connections[Idx].zip.rbuf, readbuf,
1658 "Could not append received data to zip input buffer (connection %d): %d bytes!",
1660 Conn_Close(Idx, "Receive buffer space exhausted", NULL,
1667 if (!array_catb( &My_Connections[Idx].rbuf, readbuf, len)) {
1669 "Could not append received data to input buffer (connection %d): %d bytes!",
1671 Conn_Close(Idx, "Receive buffer space exhausted", NULL, false );
1675 /* Update connection statistics */
1676 My_Connections[Idx].bytes_in += len;
1677 My_Connections[Idx].bps += Handle_Buffer(Idx);
1679 /* Make sure that there is still a valid client registered */
1680 c = Conn_GetClient(Idx);
1684 /* Update timestamp of last data received if this connection is
1685 * registered as a user, server or service connection. Don't update
1686 * otherwise, so users have at least Conf_PongTimeout seconds time to
1687 * register with the IRC server -- see Check_Connections().
1688 * Update "lastping", too, if time shifted backwards ... */
1689 if (Client_Type(c) == CLIENT_USER
1690 || Client_Type(c) == CLIENT_SERVER
1691 || Client_Type(c) == CLIENT_SERVICE) {
1693 if (My_Connections[Idx].lastdata != t)
1694 My_Connections[Idx].bps = 0;
1696 My_Connections[Idx].lastdata = t;
1697 if (My_Connections[Idx].lastping > t)
1698 My_Connections[Idx].lastping = t;
1701 /* Look at the data in the (read-) buffer of this connection */
1702 if (Client_Type(c) != CLIENT_SERVER
1703 && Client_Type(c) != CLIENT_UNKNOWNSERVER
1704 && Client_Type(c) != CLIENT_SERVICE
1705 && My_Connections[Idx].bps >= maxbps) {
1706 LogDebug("Throttling connection %d: BPS exceeded! (%u >= %u)",
1707 Idx, My_Connections[Idx].bps, maxbps);
1708 Conn_SetPenalty(Idx, 1);
1710 } /* Read_Request */
1714 * Handle all data in the connection read-buffer.
1716 * Data is processed until no complete command is left in the read buffer,
1717 * or MAX_COMMANDS[_SERVER|_SERVICE] commands were processed.
1718 * When a fatal error occurs, the connection is shut down.
1720 * @param Idx Index of the connection.
1721 * @returns Number of bytes processed.
1724 Handle_Buffer(CONN_ID Idx)
1727 char *ptr1, *ptr2, *first_eol;
1735 unsigned int i, maxcmd = MAX_COMMANDS, len_processed = 0;
1738 c = Conn_GetClient(Idx);
1739 starttime = time(NULL);
1743 /* Servers get special command limits that depend on the user count */
1744 switch (Client_Type(c)) {
1746 maxcmd = (int)(Client_UserCount() / 5)
1747 + MAX_COMMANDS_SERVER_MIN;
1748 /* Allow servers to handle even more commands while peering
1749 * to speed up server login and network synchronisation. */
1750 if (Conn_LastPing(Idx) == 0)
1753 case CLIENT_SERVICE:
1754 maxcmd = MAX_COMMANDS_SERVICE; break;
1757 for (i=0; i < maxcmd; i++) {
1759 if (My_Connections[Idx].delaytime > starttime)
1762 /* Unpack compressed data, if compression is in use */
1763 if (Conn_OPTION_ISSET(&My_Connections[Idx], CONN_ZIP)) {
1764 /* When unzipping fails, Unzip_Buffer() shuts
1765 * down the connection itself */
1766 if (!Unzip_Buffer(Idx))
1771 if (0 == array_bytes(&My_Connections[Idx].rbuf))
1774 /* Make sure that the buffer is NULL terminated */
1775 if (!array_cat0_temporary(&My_Connections[Idx].rbuf)) {
1776 Conn_Close(Idx, NULL,
1777 "Can't allocate memory [Handle_Buffer]",
1782 /* RFC 2812, section "2.3 Messages", 5th paragraph:
1783 * "IRC messages are always lines of characters terminated
1784 * with a CR-LF (Carriage Return - Line Feed) pair [...]". */
1786 ptr = strstr(array_start(&My_Connections[Idx].rbuf), "\r\n");
1789 /* Check for non-RFC-compliant request (only CR or LF)?
1790 * Unfortunately, there are quite a few clients out there
1791 * that do this -- e. g. mIRC, BitchX, and Trillian :-( */
1792 ptr1 = strchr(array_start(&My_Connections[Idx].rbuf), '\r');
1793 ptr2 = strchr(array_start(&My_Connections[Idx].rbuf), '\n');
1795 /* Check if there is a single CR or LF _before_ the
1796 * corerct CR+LF line terminator: */
1797 first_eol = ptr1 < ptr2 ? ptr1 : ptr2;
1798 if (first_eol < ptr) {
1799 /* Single CR or LF before CR+LF found */
1803 } else if (ptr1 || ptr2) {
1804 /* No CR+LF terminated command found, but single
1805 * CR or LF found ... */
1807 ptr = ptr1 < ptr2 ? ptr1 : ptr2;
1809 ptr = ptr1 ? ptr1 : ptr2;
1817 /* Complete (=line terminated) request found, handle it! */
1820 len = ptr - (char *)array_start(&My_Connections[Idx].rbuf) + delta;
1822 if (len > (COMMAND_LEN - 1)) {
1823 /* Request must not exceed 512 chars (incl. CR+LF!),
1824 * see RFC 2812. Disconnect Client if this happens. */
1826 "Request too long (connection %d): %d bytes (max. %d expected)!",
1827 Idx, array_bytes(&My_Connections[Idx].rbuf),
1829 Conn_Close(Idx, NULL, "Request too long", true);
1833 len_processed += (unsigned int)len;
1835 /* Request is empty (only '\r\n', '\r' or '\n');
1836 * delta is 2 ('\r\n') or 1 ('\r' or '\n'), see above */
1837 array_moveleft(&My_Connections[Idx].rbuf, 1, len);
1841 /* remember if stream is already compressed */
1842 old_z = My_Connections[Idx].options & CONN_ZIP;
1845 My_Connections[Idx].msg_in++;
1847 (Idx, (char *)array_start(&My_Connections[Idx].rbuf)))
1848 return 0; /* error -> connection has been closed */
1850 array_moveleft(&My_Connections[Idx].rbuf, 1, len);
1852 LogDebug("Connection %d: %d bytes left in read buffer.",
1853 Idx, array_bytes(&My_Connections[Idx].rbuf));
1856 if ((!old_z) && (My_Connections[Idx].options & CONN_ZIP) &&
1857 (array_bytes(&My_Connections[Idx].rbuf) > 0)) {
1858 /* The last command activated socket compression.
1859 * Data that was read after that needs to be copied
1860 * to the unzip buffer for decompression: */
1862 (&My_Connections[Idx].zip.rbuf,
1863 &My_Connections[Idx].rbuf)) {
1864 Conn_Close(Idx, NULL,
1865 "Can't allocate memory [Handle_Buffer]",
1870 array_trunc(&My_Connections[Idx].rbuf);
1872 ("Moved already received data (%u bytes) to uncompression buffer.",
1873 array_bytes(&My_Connections[Idx].zip.rbuf));
1877 return len_processed;
1878 } /* Handle_Buffer */
1882 * Check whether established connections are still alive or not.
1883 * If not, play PING-PONG first; and if that doesn't help either,
1884 * disconnect the respective peer.
1887 Check_Connections(void)
1893 for (i = 0; i < Pool_Size; i++) {
1894 if (My_Connections[i].sock < 0)
1897 c = Conn_GetClient(i);
1898 if (c && ((Client_Type(c) == CLIENT_USER)
1899 || (Client_Type(c) == CLIENT_SERVER)
1900 || (Client_Type(c) == CLIENT_SERVICE))) {
1901 /* connected User, Server or Service */
1902 if (My_Connections[i].lastping >
1903 My_Connections[i].lastdata) {
1904 /* We already sent a ping */
1905 if (My_Connections[i].lastping <
1906 time(NULL) - Conf_PongTimeout) {
1908 snprintf(msg, sizeof(msg),
1909 "Ping timeout: %d seconds",
1911 LogDebug("Connection %d: %s.", i, msg);
1912 Conn_Close(i, NULL, msg, true);
1914 } else if (My_Connections[i].lastdata <
1915 time(NULL) - Conf_PingTimeout) {
1916 /* We need to send a PING ... */
1917 LogDebug("Connection %d: sending PING ...", i);
1919 Conn_WriteStr(i, "PING :%s",
1920 Client_ID(Client_ThisServer()));
1923 /* The connection is not fully established yet, so
1924 * we don't do the PING-PONG game here but instead
1925 * disconnect the client after "a short time" if it's
1926 * still not registered. */
1928 if (My_Connections[i].lastdata <
1929 time(NULL) - Conf_PongTimeout) {
1931 ("Unregistered connection %d timed out ...",
1933 Conn_Close(i, NULL, "Timeout", false);
1937 } /* Check_Connections */
1941 * Check if further server links should be established.
1949 time_now = time(NULL);
1951 /* Check all configured servers */
1952 for (i = 0; i < MAX_SERVERS; i++) {
1953 if (Conf_Server[i].conn_id != NONE)
1954 continue; /* Already establishing or connected */
1955 if (!Conf_Server[i].host[0] || !Conf_Server[i].port > 0)
1956 continue; /* No host and/or port configured */
1957 if (Conf_Server[i].flags & CONF_SFLAG_DISABLED)
1958 continue; /* Disabled configuration entry */
1959 if (Conf_Server[i].lasttry > (time_now - Conf_ConnectRetry))
1960 continue; /* We have to wait a little bit ... */
1962 /* Is there already a connection in this group? */
1963 if (Conf_Server[i].group > NONE) {
1964 for (n = 0; n < MAX_SERVERS; n++) {
1967 if ((Conf_Server[n].conn_id != NONE) &&
1968 (Conf_Server[n].group == Conf_Server[i].group))
1971 if (n < MAX_SERVERS)
1975 /* Okay, try to connect now */
1977 "Preparing to establish a new server link for \"%s\" ...",
1978 Conf_Server[i].name);
1979 Conf_Server[i].lasttry = time_now;
1980 Conf_Server[i].conn_id = SERVER_WAIT;
1981 assert(Proc_GetPipeFd(&Conf_Server[i].res_stat) < 0);
1982 Resolve_Name(&Conf_Server[i].res_stat, Conf_Server[i].host,
1983 cb_Connect_to_Server);
1985 } /* Check_Servers */
1989 * Establish a new outgoing server connection.
1991 * @param Server Configuration index of the server.
1992 * @param dest Destination IP address to connect to.
1995 New_Server( int Server , ng_ipaddr_t *dest)
1997 /* Establish new server link */
1998 char ip_str[NG_INET_ADDRSTRLEN];
1999 int af_dest, res, new_sock;
2002 assert( Server > NONE );
2004 /* Make sure that the remote server hasn't re-linked to this server
2005 * asynchronously on its own */
2006 if (Conf_Server[Server].conn_id > NONE) {
2008 "Connection to \"%s\" meanwhile re-established, aborting preparation.");
2012 if (!ng_ipaddr_tostr_r(dest, ip_str)) {
2013 Log(LOG_WARNING, "New_Server: Could not convert IP to string");
2017 af_dest = ng_ipaddr_af(dest);
2018 new_sock = socket(af_dest, SOCK_STREAM, 0);
2021 "Establishing connection for \"%s\" to \"%s:%d\" (%s), socket %d ...",
2022 Conf_Server[Server].name, Conf_Server[Server].host,
2023 Conf_Server[Server].port, ip_str, new_sock);
2026 Log(LOG_CRIT, "Can't create socket (af %d): %s!",
2027 af_dest, strerror(errno));
2031 if (!Init_Socket(new_sock))
2034 /* is a bind address configured? */
2035 res = ng_ipaddr_af(&Conf_Server[Server].bind_addr);
2036 /* if yes, bind now. If it fails, warn and let connect() pick a source address */
2037 if (res && bind(new_sock, (struct sockaddr *) &Conf_Server[Server].bind_addr,
2038 ng_ipaddr_salen(&Conf_Server[Server].bind_addr)))
2040 ng_ipaddr_tostr_r(&Conf_Server[Server].bind_addr, ip_str);
2041 Log(LOG_WARNING, "Can't bind socket to %s: %s!", ip_str, strerror(errno));
2043 ng_ipaddr_setport(dest, Conf_Server[Server].port);
2044 res = connect(new_sock, (struct sockaddr *) dest, ng_ipaddr_salen(dest));
2045 if(( res != 0 ) && ( errno != EINPROGRESS )) {
2046 Log( LOG_CRIT, "Can't connect socket: %s!", strerror( errno ));
2051 if (!array_alloc(&My_ConnArray, sizeof(CONNECTION), (size_t)new_sock)) {
2053 "Cannot allocate memory for server connection (socket %d)",
2059 if (!io_event_create( new_sock, IO_WANTWRITE, cb_connserver)) {
2060 Log(LOG_ALERT, "io_event_create(): could not add fd %d", strerror(errno));
2065 My_Connections = array_start(&My_ConnArray);
2067 assert(My_Connections[new_sock].sock <= 0);
2069 Init_Conn_Struct(new_sock);
2071 ng_ipaddr_tostr_r(dest, ip_str);
2072 c = Client_NewLocal(new_sock, ip_str, CLIENT_UNKNOWNSERVER, false);
2074 Log( LOG_ALERT, "Can't establish connection: can't create client structure!" );
2079 /* Conn_Close() decrements this counter again */
2080 Account_Connection();
2081 Client_SetIntroducer( c, c );
2082 Client_SetToken( c, TOKEN_OUTBOUND );
2084 /* Register connection */
2085 if (!Conf_SetServer(Server, new_sock))
2087 My_Connections[new_sock].sock = new_sock;
2088 My_Connections[new_sock].addr = *dest;
2089 My_Connections[new_sock].client = c;
2090 strlcpy( My_Connections[new_sock].host, Conf_Server[Server].host,
2091 sizeof(My_Connections[new_sock].host ));
2094 if (Conf_Server[Server].SSLConnect && !ConnSSL_PrepareConnect( &My_Connections[new_sock],
2095 &Conf_Server[Server] ))
2097 Log(LOG_ALERT, "Could not initialize SSL for outgoing connection");
2098 Conn_Close( new_sock, "Could not initialize SSL for outgoing connection", NULL, false );
2099 Init_Conn_Struct( new_sock );
2100 Conf_Server[Server].conn_id = NONE;
2104 LogDebug("Registered new connection %d on socket %d (%ld in total).",
2105 new_sock, My_Connections[new_sock].sock, NumConnections);
2106 Conn_OPTION_ADD( &My_Connections[new_sock], CONN_ISCONNECTING );
2111 * Initialize connection structure.
2113 * @param Idx Connection index.
2116 Init_Conn_Struct(CONN_ID Idx)
2118 time_t now = time(NULL);
2120 memset(&My_Connections[Idx], 0, sizeof(CONNECTION));
2121 My_Connections[Idx].sock = -1;
2122 My_Connections[Idx].signon = now;
2123 My_Connections[Idx].lastdata = now;
2124 My_Connections[Idx].lastprivmsg = now;
2125 Proc_InitStruct(&My_Connections[Idx].proc_stat);
2128 My_Connections[Idx].iconv_from = (iconv_t)(-1);
2129 My_Connections[Idx].iconv_to = (iconv_t)(-1);
2131 } /* Init_Conn_Struct */
2135 * Initialize options of a new socket.
2137 * For example, we try to set socket options SO_REUSEADDR and IPTOS_LOWDELAY.
2138 * The socket is automatically closed if a fatal error is encountered.
2140 * @param Sock Socket handle.
2141 * @returns false if socket was closed due to fatal error.
2144 Init_Socket( int Sock )
2148 if (!io_setnonblock(Sock)) {
2149 Log( LOG_CRIT, "Can't enable non-blocking mode for socket: %s!", strerror( errno ));
2154 /* Don't block this port after socket shutdown */
2156 if( setsockopt( Sock, SOL_SOCKET, SO_REUSEADDR, &value, (socklen_t)sizeof( value )) != 0 )
2158 Log( LOG_ERR, "Can't set socket option SO_REUSEADDR: %s!", strerror( errno ));
2159 /* ignore this error */
2162 /* Set type of service (TOS) */
2163 #if defined(IPPROTO_IP) && defined(IPTOS_LOWDELAY)
2164 value = IPTOS_LOWDELAY;
2165 if (setsockopt(Sock, IPPROTO_IP, IP_TOS, &value,
2166 (socklen_t) sizeof(value))) {
2167 LogDebug("Can't set socket option IP_TOS: %s!",
2169 /* ignore this error */
2171 LogDebug("IP_TOS on socket %d has been set to IPTOS_LOWDELAY.",
2180 * Read results of a resolver sub-process and try to initiate a new server
2183 * @param fd File descriptor of the pipe to the sub-process.
2184 * @param events (ignored IO specification)
2187 cb_Connect_to_Server(int fd, UNUSED short events)
2189 /* Read result of resolver sub-process from pipe and start connection */
2192 ng_ipaddr_t dest_addrs[4]; /* we can handle at most 3; but we read up to
2193 four so we can log the 'more than we can handle'
2194 condition. First result is tried immediately, rest
2195 is saved for later if needed. */
2197 LogDebug("Resolver: Got forward lookup callback on fd %d, events %d", fd, events);
2199 for (i=0; i < MAX_SERVERS; i++) {
2200 if (Proc_GetPipeFd(&Conf_Server[i].res_stat) == fd )
2204 if( i >= MAX_SERVERS) {
2205 /* Ops, no matching server found?! */
2207 LogDebug("Resolver: Got Forward Lookup callback for unknown server!?");
2211 /* Read result from pipe */
2212 len = Proc_Read(&Conf_Server[i].res_stat, dest_addrs, sizeof(dest_addrs));
2213 Proc_Close(&Conf_Server[i].res_stat);
2215 /* Error resolving hostname: reset server structure */
2216 Conf_Server[i].conn_id = NONE;
2220 assert((len % sizeof(ng_ipaddr_t)) == 0);
2222 LogDebug("Got result from resolver: %u structs (%u bytes).", len/sizeof(ng_ipaddr_t), len);
2224 memset(&Conf_Server[i].dst_addr, 0, sizeof(Conf_Server[i].dst_addr));
2225 if (len > sizeof(ng_ipaddr_t)) {
2226 /* more than one address for this hostname, remember them
2227 * in case first address is unreachable/not available */
2228 len -= sizeof(ng_ipaddr_t);
2229 if (len > sizeof(Conf_Server[i].dst_addr)) {
2230 len = sizeof(Conf_Server[i].dst_addr);
2232 "Notice: Resolver returned more IP Addresses for host than we can handle, additional addresses dropped.");
2234 memcpy(&Conf_Server[i].dst_addr, &dest_addrs[1], len);
2237 New_Server(i, dest_addrs);
2238 } /* cb_Read_Forward_Lookup */
2242 * Read results of a resolver sub-process from the pipe and update the
2243 * apropriate connection/client structure(s): hostname and/or IDENT user name.
2245 * @param r_fd File descriptor of the pipe to the sub-process.
2246 * @param events (ignored IO specification)
2249 cb_Read_Resolver_Result( int r_fd, UNUSED short events )
2256 char readbuf[HOST_LEN + 2 + CLIENT_USER_LEN];
2259 char readbuf[HOST_LEN + 1];
2262 LogDebug("Resolver: Got callback on fd %d, events %d", r_fd, events );
2263 i = Conn_GetFromProc(r_fd);
2265 /* Ops, none found? Probably the connection has already
2266 * been closed!? We'll ignore that ... */
2268 LogDebug("Resolver: Got callback for unknown connection!?");
2272 /* Read result from pipe */
2273 len = Proc_Read(&My_Connections[i].proc_stat, readbuf, sizeof readbuf -1);
2274 Proc_Close(&My_Connections[i].proc_stat);
2278 readbuf[len] = '\0';
2279 identptr = strchr(readbuf, '\n');
2280 assert(identptr != NULL);
2282 Log( LOG_CRIT, "Resolver: Got malformed result!");
2287 LogDebug("Got result from resolver: \"%s\" (%u bytes read).", readbuf, len);
2288 /* Okay, we got a complete result: this is a host name for outgoing
2289 * connections and a host name and IDENT user name (if enabled) for
2290 * incoming connections.*/
2291 assert ( My_Connections[i].sock >= 0 );
2292 /* Incoming connection. Search client ... */
2293 c = Conn_GetClient( i );
2294 assert( c != NULL );
2296 /* Only update client information of unregistered clients.
2297 * Note: user commands (e. g. WEBIRC) are always read _after_ reading
2298 * the resolver results, so we don't have to worry to override settings
2299 * from these commands here. */
2300 if(Client_Type(c) == CLIENT_UNKNOWN) {
2301 strlcpy(My_Connections[i].host, readbuf,
2302 sizeof(My_Connections[i].host));
2303 Client_SetHostname(c, readbuf);
2304 if (Conf_NoticeAuth)
2305 (void)Conn_WriteStr(i,
2306 "NOTICE AUTH :*** Found your hostname: %s",
2307 My_Connections[i].host);
2313 if ((*ptr < '0' || *ptr > '9') &&
2314 (*ptr < 'A' || *ptr > 'Z') &&
2315 (*ptr < 'a' || *ptr > 'z'))
2320 /* Erroneous IDENT reply */
2322 "Got invalid IDENT reply for connection %d! Ignored.",
2326 "IDENT lookup for connection %d: \"%s\".",
2328 Client_SetUser(c, identptr, true);
2330 if (Conf_NoticeAuth) {
2331 (void)Conn_WriteStr(i,
2332 "NOTICE AUTH :*** Got %sident response%s%s",
2333 *ptr ? "invalid " : "",
2335 *ptr ? "" : identptr);
2338 Log(LOG_INFO, "IDENT lookup for connection %d: no result.", i);
2339 if (Conf_NoticeAuth && Conf_Ident)
2340 (void)Conn_WriteStr(i,
2341 "NOTICE AUTH :*** No ident response");
2345 if (Conf_NoticeAuth)
2346 (void)Handle_Write(i);
2348 Class_HandleServerBans(c);
2351 else Log( LOG_DEBUG, "Resolver: discarding result for already registered connection %d.", i );
2353 } /* cb_Read_Resolver_Result */
2357 * Write a "simple" (error) message to a socket.
2359 * The message is sent without using the connection write buffers, without
2360 * compression/encryption, and even without any error reporting. It is
2361 * designed for error messages of e.g. New_Connection().
2363 * @param Sock Socket handle.
2364 * @param Msg Message string to send.
2367 Simple_Message(int Sock, const char *Msg)
2369 char buf[COMMAND_LEN];
2372 assert(Sock > NONE);
2373 assert(Msg != NULL);
2375 strlcpy(buf, Msg, sizeof buf - 2);
2376 len = strlcat(buf, "\r\n", sizeof buf);
2377 if (write(Sock, buf, len) < 0) {
2378 /* Because this function most probably got called to log
2379 * an error message, any write error is ignored here to
2380 * avoid an endless loop. But casting the result of write()
2381 * to "void" doesn't satisfy the GNU C code attribute
2382 * "warn_unused_result" which is used by some versions of
2383 * glibc (e.g. 2.11.1), therefore this silly error
2384 * "handling" code here :-( */
2387 } /* Simple_Error */
2391 * Get CLIENT structure that belongs to a local connection identified by its
2392 * index number. Each connection belongs to a client by definition, so it is
2393 * not required that the caller checks for NULL return values.
2395 * @param Idx Connection index number.
2396 * @returns Pointer to CLIENT structure.
2399 Conn_GetClient( CONN_ID Idx )
2404 c = array_get(&My_ConnArray, sizeof (CONNECTION), (size_t)Idx);
2406 return c ? c->client : NULL;
2410 * Get PROC_STAT sub-process structure of a connection.
2412 * @param Idx Connection index number.
2413 * @returns PROC_STAT structure.
2416 Conn_GetProcStat(CONN_ID Idx)
2421 c = array_get(&My_ConnArray, sizeof (CONNECTION), (size_t)Idx);
2423 return &c->proc_stat;
2424 } /* Conn_GetProcStat */
2428 * Get CONN_ID from file descriptor associated to a subprocess structure.
2430 * @param fd File descriptor.
2431 * @returns CONN_ID or NONE (-1).
2434 Conn_GetFromProc(int fd)
2439 for (i = 0; i < Pool_Size; i++) {
2440 if ((My_Connections[i].sock != NONE)
2441 && (Proc_GetPipeFd(&My_Connections[i].proc_stat) == fd))
2445 } /* Conn_GetFromProc */
2451 Conn_GetAuthPing(CONN_ID Idx)
2453 assert (Idx != NONE);
2454 return My_Connections[Idx].auth_ping;
2455 } /* Conn_GetAuthPing */
2458 Conn_SetAuthPing(CONN_ID Idx, long ID)
2460 assert (Idx != NONE);
2461 My_Connections[Idx].auth_ping = ID;
2462 } /* Conn_SetAuthPing */
2470 * Get information about used SSL chiper.
2472 * @param Idx Connection index number.
2473 * @param buf Buffer for returned information text.
2474 * @param len Size of return buffer "buf".
2475 * @returns true on success, false otherwise.
2478 Conn_GetCipherInfo(CONN_ID Idx, char *buf, size_t len)
2482 assert(Idx < (int) array_length(&My_ConnArray, sizeof(CONNECTION)));
2483 return ConnSSL_GetCipherInfo(&My_Connections[Idx], buf, len);
2488 * Check if a connection is SSL-enabled or not.
2490 * @param Idx Connection index number.
2491 * @return true if connection is SSL-enabled, false otherwise.
2494 Conn_UsesSSL(CONN_ID Idx)
2498 assert(Idx < (int) array_length(&My_ConnArray, sizeof(CONNECTION)));
2499 return Conn_OPTION_ISSET(&My_Connections[Idx], CONN_SSL);
2508 * Dump internal state of the "connection module".
2511 Conn_DebugDump(void)
2515 Log(LOG_DEBUG, "Connection status:");
2516 for (i = 0; i < Pool_Size; i++) {
2517 if (My_Connections[i].sock == NONE)
2520 " - %d: host=%s, lastdata=%ld, lastping=%ld, delaytime=%ld, flag=%d, options=%d, bps=%d, client=%s",
2521 My_Connections[i].sock, My_Connections[i].host,
2522 My_Connections[i].lastdata, My_Connections[i].lastping,
2523 My_Connections[i].delaytime, My_Connections[i].flag,
2524 My_Connections[i].options, My_Connections[i].bps,
2525 My_Connections[i].client ? Client_ID(My_Connections[i].client) : "-");
2527 } /* Conn_DumpClients */