2 * ngIRCd -- The Next Generation IRC Daemon
3 * Copyright (c)2001-2012 Alexander Barton (alex@barton.de) and Contributors.
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation; either version 2 of the License, or
8 * (at your option) any later version.
9 * Please read the file COPYING, README and AUTHORS for more information.
22 * Connection management
37 #include <sys/socket.h>
39 #include <sys/types.h>
41 #include <netinet/in.h>
43 #ifdef HAVE_NETINET_IP_H
44 # ifdef HAVE_NETINET_IN_SYSTM_H
45 # include <netinet/in_systm.h>
47 # include <netinet/ip.h>
51 # include <stdint.h> /* e.g. for Mac OS X */
55 # include <tcpd.h> /* for TCP Wrappers */
72 #include "conn-func.h"
74 #include "ng_ipaddr.h"
82 #define SERVER_WAIT (NONE - 1)
84 #define MAX_COMMANDS 3
85 #define MAX_COMMANDS_SERVER_MIN 10
86 #define MAX_COMMANDS_SERVICE 10
89 static bool Handle_Write PARAMS(( CONN_ID Idx ));
90 static bool Conn_Write PARAMS(( CONN_ID Idx, char *Data, size_t Len ));
91 static int New_Connection PARAMS(( int Sock ));
92 static CONN_ID Socket2Index PARAMS(( int Sock ));
93 static void Read_Request PARAMS(( CONN_ID Idx ));
94 static unsigned int Handle_Buffer PARAMS(( CONN_ID Idx ));
95 static void Check_Connections PARAMS(( void ));
96 static void Check_Servers PARAMS(( void ));
97 static void Init_Conn_Struct PARAMS(( CONN_ID Idx ));
98 static bool Init_Socket PARAMS(( int Sock ));
99 static void New_Server PARAMS(( int Server, ng_ipaddr_t *dest ));
100 static void Simple_Message PARAMS(( int Sock, const char *Msg ));
101 static int NewListener PARAMS(( const char *listen_addr, UINT16 Port ));
102 static void Account_Connection PARAMS((void));
105 static array My_Listeners;
106 static array My_ConnArray;
107 static size_t NumConnections, NumConnectionsMax, NumConnectionsAccepted;
110 int allow_severity = LOG_INFO;
111 int deny_severity = LOG_ERR;
114 static void server_login PARAMS((CONN_ID idx));
117 extern struct SSLOptions Conf_SSLOptions;
118 static void cb_connserver_login_ssl PARAMS((int sock, short what));
119 static void cb_clientserver_ssl PARAMS((int sock, short what));
121 static void cb_Read_Resolver_Result PARAMS((int sock, UNUSED short what));
122 static void cb_Connect_to_Server PARAMS((int sock, UNUSED short what));
123 static void cb_clientserver PARAMS((int sock, short what));
127 * IO callback for listening sockets: handle new connections. This callback
128 * gets called when a new non-SSL connection should be accepted.
130 * @param sock Socket descriptor.
131 * @param irrelevant (ignored IO specification)
134 cb_listen(int sock, short irrelevant)
137 (void) New_Connection(sock);
143 * IO callback for listening SSL sockets: handle new connections. This callback
144 * gets called when a new SSL-enabled connection should be accepted.
146 * @param sock Socket descriptor.
147 * @param irrelevant (ignored IO specification)
150 cb_listen_ssl(int sock, short irrelevant)
155 fd = New_Connection(sock);
158 io_event_setcb(My_Connections[fd].sock, cb_clientserver_ssl);
164 * IO callback for new outgoing non-SSL server connections.
166 * @param sock Socket descriptor.
167 * @param what IO specification (IO_WANTREAD/IO_WANTWRITE/...).
170 cb_connserver(int sock, UNUSED short what)
172 int res, err, server;
174 CONN_ID idx = Socket2Index( sock );
177 LogDebug("cb_connserver wants to write on unknown socket?!");
182 assert(what & IO_WANTWRITE);
184 /* Make sure that the server is still configured; it could have been
185 * removed in the meantime! */
186 server = Conf_GetServer(idx);
188 Log(LOG_ERR, "Connection on socket %d to \"%s\" aborted!",
189 sock, My_Connections[idx].host);
190 Conn_Close(idx, "Connection aborted!", NULL, false);
194 /* connect() finished, get result. */
195 sock_len = (socklen_t)sizeof(err);
196 res = getsockopt(My_Connections[idx].sock, SOL_SOCKET, SO_ERROR,
198 assert(sock_len == sizeof(err));
200 /* Error while connecting? */
201 if ((res != 0) || (err != 0)) {
203 Log(LOG_CRIT, "getsockopt (connection %d): %s!",
204 idx, strerror(errno));
207 "Can't connect socket to \"%s:%d\" (connection %d): %s!",
208 My_Connections[idx].host, Conf_Server[server].port,
211 Conn_Close(idx, "Can't connect!", NULL, false);
213 if (ng_ipaddr_af(&Conf_Server[server].dst_addr[0])) {
214 /* more addresses to try... */
215 New_Server(server, &Conf_Server[server].dst_addr[0]);
216 /* connection to dst_addr[0] is now in progress, so
217 * remove this address... */
218 Conf_Server[server].dst_addr[0] =
219 Conf_Server[server].dst_addr[1];
220 memset(&Conf_Server[server].dst_addr[1], 0,
221 sizeof(Conf_Server[server].dst_addr[1]));
226 /* connect() succeeded, remove all additional addresses */
227 memset(&Conf_Server[server].dst_addr, 0,
228 sizeof(Conf_Server[server].dst_addr));
230 Conn_OPTION_DEL( &My_Connections[idx], CONN_ISCONNECTING );
232 if ( Conn_OPTION_ISSET( &My_Connections[idx], CONN_SSL_CONNECT )) {
233 io_event_setcb( sock, cb_connserver_login_ssl );
234 io_event_add( sock, IO_WANTWRITE|IO_WANTREAD );
243 * Login to a remote server.
245 * @param idx Connection index.
248 server_login(CONN_ID idx)
251 "Connection %d (socket %d) with \"%s:%d\" established. Now logging in ...",
252 idx, My_Connections[idx].sock, My_Connections[idx].host,
253 Conf_Server[Conf_GetServer(idx)].port);
255 io_event_setcb( My_Connections[idx].sock, cb_clientserver);
256 io_event_add( My_Connections[idx].sock, IO_WANTREAD|IO_WANTWRITE);
258 /* Send PASS and SERVER command to peer */
259 Conn_WriteStr( idx, "PASS %s %s", Conf_Server[Conf_GetServer( idx )].pwd_out, NGIRCd_ProtoID );
260 Conn_WriteStr( idx, "SERVER %s :%s", Conf_ServerName, Conf_ServerInfo );
266 * IO callback for new outgoing SSL-enabled server connections.
268 * @param sock Socket descriptor.
269 * @param unused (ignored IO specification)
272 cb_connserver_login_ssl(int sock, short unused)
274 CONN_ID idx = Socket2Index(sock);
282 switch (ConnSSL_Connect( &My_Connections[idx])) {
284 case 0: LogDebug("ConnSSL_Connect: not ready");
287 Log(LOG_ERR, "SSL connection on socket %d failed!", sock);
288 Conn_Close(idx, "Can't connect!", NULL, false);
292 Log( LOG_INFO, "SSL connection %d with \"%s:%d\" established.", idx,
293 My_Connections[idx].host, Conf_Server[Conf_GetServer( idx )].port );
301 * IO callback for established non-SSL client and server connections.
303 * @param sock Socket descriptor.
304 * @param what IO specification (IO_WANTREAD/IO_WANTWRITE/...).
307 cb_clientserver(int sock, short what)
309 CONN_ID idx = Socket2Index(sock);
318 if (what & IO_WANTREAD
319 || (Conn_OPTION_ISSET(&My_Connections[idx], CONN_SSL_WANT_WRITE))) {
320 /* if TLS layer needs to write additional data, call
321 * Read_Request() instead so that SSL/TLS can continue */
325 if (what & IO_WANTREAD)
328 if (what & IO_WANTWRITE)
335 * IO callback for established SSL-enabled client and server connections.
337 * @param sock Socket descriptor.
338 * @param what IO specification (IO_WANTREAD/IO_WANTWRITE/...).
341 cb_clientserver_ssl(int sock, short what)
343 CONN_ID idx = Socket2Index(sock);
352 switch (ConnSSL_Accept(&My_Connections[idx])) {
356 return; /* EAGAIN: callback will be invoked again by IO layer */
358 Conn_Close(idx, "SSL accept error, closing socket", "SSL accept error", false);
361 if (what & IO_WANTREAD)
364 if (what & IO_WANTWRITE)
367 io_event_setcb(sock, cb_clientserver); /* SSL handshake completed */
373 * Initialize connecion module.
380 /* Speicher fuer Verbindungs-Pool anfordern */
381 Pool_Size = CONNECTION_POOL;
382 if ((Conf_MaxConnections > 0) &&
383 (Pool_Size > Conf_MaxConnections))
384 Pool_Size = Conf_MaxConnections;
386 if (!array_alloc(&My_ConnArray, sizeof(CONNECTION), (size_t)Pool_Size)) {
387 Log(LOG_EMERG, "Can't allocate memory! [Conn_Init]");
391 /* FIXME: My_Connetions/Pool_Size is needed by other parts of the
392 * code; remove them! */
393 My_Connections = (CONNECTION*) array_start(&My_ConnArray);
395 LogDebug("Allocated connection pool for %d items (%ld bytes).",
396 array_length(&My_ConnArray, sizeof(CONNECTION)),
397 array_bytes(&My_ConnArray));
399 assert(array_length(&My_ConnArray, sizeof(CONNECTION)) >= (size_t)Pool_Size);
401 array_free( &My_Listeners );
403 for (i = 0; i < Pool_Size; i++)
409 * Clean up connection module.
416 Conn_ExitListeners();
418 LogDebug("Shutting down all connections ..." );
419 for( idx = 0; idx < Pool_Size; idx++ ) {
420 if( My_Connections[idx].sock > NONE ) {
421 Conn_Close( idx, NULL, NGIRCd_SignalRestart ?
422 "Server going down (restarting)":"Server going down", true );
426 array_free(&My_ConnArray);
427 My_Connections = NULL;
429 io_library_shutdown();
434 * Close all sockets (file descriptors) of open connections.
435 * This is useful in forked child processes, for example, to make sure that
436 * they don't hold connections open that the main process wants to close.
439 Conn_CloseAllSockets(int ExceptOf)
443 for(idx = 0; idx < Pool_Size; idx++) {
444 if(My_Connections[idx].sock > NONE &&
445 My_Connections[idx].sock != ExceptOf)
446 close(My_Connections[idx].sock);
452 * Initialize listening ports.
454 * @param a Array containing the ports the daemon should listen on.
455 * @param listen_addr Address the socket should listen on (can be "0.0.0.0").
456 * @param func IO callback function to register.
457 * @returns Number of listening sockets created.
460 ports_initlisteners(array *a, const char *listen_addr, void (*func)(int,short))
462 unsigned int created = 0;
467 len = array_length(a, sizeof (UINT16));
468 port = array_start(a);
470 fd = NewListener(listen_addr, *port);
475 if (!io_event_create( fd, IO_WANTREAD, func )) {
476 Log( LOG_ERR, "io_event_create(): Could not add listening fd %d (port %u): %s!",
477 fd, (unsigned int) *port, strerror(errno));
490 * Initialize all listening sockets.
492 * @returns Number of created listening sockets
495 Conn_InitListeners( void )
497 /* Initialize ports on which the server should accept connections */
498 unsigned int created = 0;
499 char *copy, *listen_addr;
501 assert(Conf_ListenAddress);
503 /* can't use Conf_ListenAddress directly, see below */
504 copy = strdup(Conf_ListenAddress);
506 Log(LOG_CRIT, "Cannot copy %s: %s", Conf_ListenAddress, strerror(errno));
509 listen_addr = strtok(copy, ",");
511 while (listen_addr) {
512 ngt_TrimStr(listen_addr);
514 created += ports_initlisteners(&Conf_ListenPorts, listen_addr, cb_listen);
516 created += ports_initlisteners(&Conf_SSLOptions.ListenPorts, listen_addr, cb_listen_ssl);
520 listen_addr = strtok(NULL, ",");
523 /* Can't free() Conf_ListenAddress here: on REHASH, if the config file
524 * cannot be re-loaded, we'd end up with a NULL Conf_ListenAddress.
525 * Instead, free() takes place in conf.c, before the config file
526 * is being parsed. */
530 } /* Conn_InitListeners */
534 * Shut down all listening sockets.
537 Conn_ExitListeners( void )
539 /* Close down all listening sockets */
543 arraylen = array_length(&My_Listeners, sizeof (int));
545 "Shutting down all listening sockets (%d total) ...", arraylen);
546 fd = array_start(&My_Listeners);
551 LogDebug("Listening socket %d closed.", *fd );
554 array_free(&My_Listeners);
555 } /* Conn_ExitListeners */
559 * Bind a socket to a specific (source) address.
561 * @param addr Address structure.
562 * @param listen_addrstr Source address as string.
563 * @param Port Port number.
564 * @returns true on success, false otherwise.
567 InitSinaddrListenAddr(ng_ipaddr_t *addr, const char *listen_addrstr, UINT16 Port)
571 ret = ng_ipaddr_init(addr, listen_addrstr, Port);
573 assert(listen_addrstr);
574 Log(LOG_CRIT, "Can't bind to [%s]:%u: can't convert ip address \"%s\"",
575 listen_addrstr, Port, listen_addrstr);
582 * Set a socket to "IPv6 only". If the given socket doesn't belong to the
583 * AF_INET6 family, or the operating system doesn't support this functionality,
584 * this function retruns silently.
586 * @param af Address family of the socket.
587 * @param sock Socket handle.
590 set_v6_only(int af, int sock)
592 #if defined(IPV6_V6ONLY) && defined(WANT_IPV6)
598 if (setsockopt(sock, IPPROTO_IPV6, IPV6_V6ONLY, &on, (socklen_t)sizeof(on)))
599 Log(LOG_ERR, "Could not set IPV6_V6ONLY: %s", strerror(errno));
608 * Initialize new listening port.
610 * @param listen_addr Local address to bind the socet to (can be 0.0.0.0).
611 * @param Port Port number on which the new socket should be listening.
612 * @returns file descriptor of the socket or -1 on failure.
615 NewListener(const char *listen_addr, UINT16 Port)
617 /* Create new listening socket on specified port */
621 if (!InitSinaddrListenAddr(&addr, listen_addr, Port))
624 af = ng_ipaddr_af(&addr);
625 sock = socket(af, SOCK_STREAM, 0);
627 Log(LOG_CRIT, "Can't create socket (af %d) : %s!", af, strerror(errno));
631 set_v6_only(af, sock);
633 if (!Init_Socket(sock))
636 if (bind(sock, (struct sockaddr *)&addr, ng_ipaddr_salen(&addr)) != 0) {
637 Log(LOG_CRIT, "Can't bind socket to address %s:%d - %s",
638 ng_ipaddr_tostr(&addr), Port, strerror(errno));
643 if( listen( sock, 10 ) != 0 ) {
644 Log( LOG_CRIT, "Can't listen on socket: %s!", strerror( errno ));
649 /* keep fd in list so we can close it when ngircd restarts/shuts down */
650 if (!array_catb( &My_Listeners,(char*) &sock, sizeof(int) )) {
651 Log( LOG_CRIT, "Can't add socket to My_Listeners array: %s!", strerror( errno ));
656 Log(LOG_INFO, "Now listening on [%s]:%d (socket %d).",
657 ng_ipaddr_tostr(&addr), Port, sock);
665 * Check if SSL library needs to read SSL-protocol related data.
667 * SSL/TLS connections require extra treatment:
668 * When either CONN_SSL_WANT_WRITE or CONN_SSL_WANT_READ is set, we
669 * need to take care of that first, before checking read/write buffers.
670 * For instance, while we might have data in our write buffer, the
671 * TLS/SSL protocol might need to read internal data first for TLS/SSL
674 * If this function returns true, such a condition is met and we have
675 * to reverse the condition (check for read even if we've data to write,
676 * do not check for read but writeability even if write-buffer is empty).
678 * @param c Connection to check.
679 * @returns true if SSL-library has to read protocol data.
682 SSL_WantRead(const CONNECTION *c)
684 if (Conn_OPTION_ISSET(c, CONN_SSL_WANT_READ)) {
685 io_event_add(c->sock, IO_WANTREAD);
692 * Check if SSL library needs to write SSL-protocol related data.
694 * Please see description of SSL_WantRead() for full description!
696 * @param c Connection to check.
697 * @returns true if SSL-library has to write protocol data.
700 SSL_WantWrite(const CONNECTION *c)
702 if (Conn_OPTION_ISSET(c, CONN_SSL_WANT_WRITE)) {
703 io_event_add(c->sock, IO_WANTWRITE);
712 SSL_WantRead(UNUSED const CONNECTION *c)
716 SSL_WantWrite(UNUSED const CONNECTION *c)
723 * "Main Loop": Loop until shutdown or restart is signalled.
725 * This function loops until a shutdown or restart of ngIRCd is signalled and
726 * calls io_dispatch() to check for readable and writable sockets every second.
727 * It checks for status changes on pending connections (e. g. when a hostname
728 * has been resolved), checks for "penalties" and timeouts, and handles the
735 unsigned int wdatalen, bytes_processed;
739 while (!NGIRCd_SignalQuit && !NGIRCd_SignalRestart) {
742 /* Check configured servers and established links */
746 /* Expire outdated class/list items */
749 /* Look for non-empty read buffers ... */
750 for (i = 0; i < Pool_Size; i++) {
751 if ((My_Connections[i].sock > NONE)
752 && (array_bytes(&My_Connections[i].rbuf) > 0)
753 && (My_Connections[i].delaytime <= t)) {
754 /* ... and try to handle the received data */
755 bytes_processed = Handle_Buffer(i);
756 /* if we processed data, and there might be
757 * more commands in the input buffer, do not
758 * try to read any more data now */
759 if (bytes_processed &&
760 array_bytes(&My_Connections[i].rbuf) > 2) {
762 ("Throttling connection %d: command limit reached!",
764 Conn_SetPenalty(i, 1);
769 /* Look for non-empty write buffers ... */
770 for (i = 0; i < Pool_Size; i++) {
771 if (My_Connections[i].sock <= NONE)
774 wdatalen = (unsigned int)array_bytes(&My_Connections[i].wbuf);
777 array_bytes(&My_Connections[i].zip.wbuf) > 0)
782 if (SSL_WantRead(&My_Connections[i]))
784 io_event_add(My_Connections[i].sock,
789 /* Check from which sockets we possibly could read ... */
790 for (i = 0; i < Pool_Size; i++) {
791 if (My_Connections[i].sock <= NONE)
794 if (SSL_WantWrite(&My_Connections[i]))
795 continue; /* TLS/SSL layer needs to write data; deal with this first */
797 if (Proc_InProgress(&My_Connections[i].proc_stat)) {
798 /* Wait for completion of forked subprocess
799 * and ignore the socket in the meantime ... */
800 io_event_del(My_Connections[i].sock,
805 if (Conn_OPTION_ISSET(&My_Connections[i], CONN_ISCONNECTING))
806 /* Wait for completion of connect() ... */
809 if (My_Connections[i].delaytime > t) {
810 /* There is a "penalty time" set: ignore socket! */
811 io_event_del(My_Connections[i].sock,
816 io_event_add(My_Connections[i].sock, IO_WANTREAD);
819 /* Set the timeout for reading from the network to 1 second,
820 * which is the granularity with witch we handle "penalty
821 * times" for example.
822 * Note: tv_sec/usec are undefined(!) after io_dispatch()
823 * returns, so we have to set it beforce each call to it! */
827 /* Wait for activity ... */
828 i = io_dispatch(&tv);
829 if (i == -1 && errno != EINTR) {
830 Log(LOG_EMERG, "Conn_Handler(): io_dispatch(): %s!",
832 Log(LOG_ALERT, "%s exiting due to fatal errors!",
838 if (NGIRCd_SignalQuit)
839 Log(LOG_NOTICE | LOG_snotice, "Server going down NOW!");
840 else if (NGIRCd_SignalRestart)
841 Log(LOG_NOTICE | LOG_snotice, "Server restarting NOW!");
846 * Write a text string into the socket of a connection.
848 * This function automatically appends CR+LF to the string and validates that
849 * the result is a valid IRC message (oversized messages are shortened, for
850 * example). Then it calls the Conn_Write() function to do the actual sending.
852 * @param Idx Index fo the connection.
853 * @param Format Format string, see printf().
854 * @returns true on success, false otherwise.
858 Conn_WriteStr(CONN_ID Idx, const char *Format, ...)
861 Conn_WriteStr(Idx, Format, va_alist)
867 char buffer[COMMAND_LEN];
872 assert( Idx > NONE );
873 assert( Format != NULL );
876 va_start( ap, Format );
880 if (vsnprintf( buffer, COMMAND_LEN - 2, Format, ap ) >= COMMAND_LEN - 2 ) {
882 * The string that should be written to the socket is longer
883 * than the allowed size of COMMAND_LEN bytes (including both
884 * the CR and LF characters). This can be caused by the
885 * IRC_WriteXXX() functions when the prefix of this server had
886 * to be added to an already "quite long" command line which
887 * has been received from a regular IRC client, for example.
889 * We are not allowed to send such "oversized" messages to
890 * other servers and clients, see RFC 2812 2.3 and 2813 3.3
891 * ("these messages SHALL NOT exceed 512 characters in length,
892 * counting all characters including the trailing CR-LF").
894 * So we have a big problem here: we should send more bytes
895 * to the network than we are allowed to and we don't know
896 * the originator (any more). The "old" behaviour of blaming
897 * the receiver ("next hop") is a bad idea (it could be just
898 * an other server only routing the message!), so the only
899 * option left is to shorten the string and to hope that the
900 * result is still somewhat useful ...
904 strcpy (buffer + sizeof(buffer) - strlen(CUT_TXTSUFFIX) - 2 - 1,
910 Log(LOG_DEBUG, " -> connection %d: '%s'.", Idx, buffer);
913 len = strlcat( buffer, "\r\n", sizeof( buffer ));
914 ok = Conn_Write(Idx, buffer, len);
915 My_Connections[Idx].msg_out++;
919 } /* Conn_WriteStr */
922 Conn_Password( CONN_ID Idx )
924 assert( Idx > NONE );
925 return My_Connections[Idx].pwd;
926 } /* Conn_Password */
929 Conn_SetPassword( CONN_ID Idx, const char *Pwd )
931 assert( Idx > NONE );
932 My_Connections[Idx].pwd = calloc(strlen(Pwd) + 1, sizeof(char));
933 if (My_Connections[Idx].pwd == NULL) {
934 Log(LOG_EMERG, "Can't allocate memory! [Conn_SetPassword]");
937 strcpy( My_Connections[Idx].pwd, Pwd );
938 } /* Conn_SetPassword */
941 * Append Data to the outbound write buffer of a connection.
943 * @param Idx Index of the connection.
944 * @param Data pointer to the data.
945 * @param Len length of Data.
946 * @returns true on success, false otherwise.
949 Conn_Write( CONN_ID Idx, char *Data, size_t Len )
952 size_t writebuf_limit = WRITEBUFFER_MAX_LEN;
953 assert( Idx > NONE );
954 assert( Data != NULL );
957 /* Is the socket still open? A previous call to Conn_Write()
958 * may have closed the connection due to a fatal error.
959 * In this case it is sufficient to return an error, as well. */
960 if (My_Connections[Idx].sock <= NONE) {
961 LogDebug("Skipped write on closed socket (connection %d).", Idx);
965 /* Make sure that there still exists a CLIENT structure associated
966 * with this connection and check if this is a server or not: */
967 c = Conn_GetClient(Idx);
969 /* Servers do get special write buffer limits, so they can
970 * generate all the messages that are required while peering. */
971 if (Client_Type(c) == CLIENT_SERVER)
972 writebuf_limit = WRITEBUFFER_SLINK_LEN;
974 LogDebug("Write on socket without client (connection %d)!?", Idx);
977 if ( Conn_OPTION_ISSET( &My_Connections[Idx], CONN_ZIP )) {
979 * Zip_Buffer() does all the dirty work for us: it flushes
980 * the (pre-)compression buffers if required and handles
981 * all error conditions. */
982 if (!Zip_Buffer(Idx, Data, Len))
988 /* Uncompressed link:
989 * Check if outbound buffer has enough space for the data. */
990 if (array_bytes(&My_Connections[Idx].wbuf) + Len >=
991 WRITEBUFFER_FLUSH_LEN) {
992 /* Buffer is full, flush it. Handle_Write deals with
993 * low-level errors, if any. */
994 if (!Handle_Write(Idx))
998 /* When the write buffer is still too big after flushing it,
999 * the connection will be killed. */
1000 if (array_bytes(&My_Connections[Idx].wbuf) + Len >=
1003 "Write buffer space exhausted (connection %d, limit is %lu bytes, %lu bytes new, %lu bytes pending)",
1004 Idx, writebuf_limit, Len,
1005 (unsigned long)array_bytes(&My_Connections[Idx].wbuf));
1006 Conn_Close(Idx, "Write buffer space exhausted", NULL, false);
1010 /* Copy data to write buffer */
1011 if (!array_catb(&My_Connections[Idx].wbuf, Data, Len))
1014 My_Connections[Idx].bytes_out += Len;
1017 /* Adjust global write counter */
1025 * Shut down a connection.
1027 * @param Idx Connection index.
1028 * @param LogMsg Message to write to the log or NULL. If no LogMsg
1029 * is given, the FwdMsg is logged.
1030 * @param FwdMsg Message to forward to remote servers.
1031 * @param InformClient If true, inform the client on the connection which is
1032 * to be shut down of the reason (FwdMsg) and send
1033 * connection statistics before disconnecting it.
1036 Conn_Close( CONN_ID Idx, const char *LogMsg, const char *FwdMsg, bool InformClient )
1038 /* Close connection. Open pipes of asynchronous resolver
1039 * sub-processes are closed down. */
1045 double in_z_k, out_z_k;
1049 assert( Idx > NONE );
1051 /* Is this link already shutting down? */
1052 if( Conn_OPTION_ISSET( &My_Connections[Idx], CONN_ISCLOSING )) {
1053 /* Conn_Close() has been called recursively for this link;
1054 * probabe reason: Handle_Write() failed -- see below. */
1055 LogDebug("Recursive request to close connection: %d", Idx );
1059 assert( My_Connections[Idx].sock > NONE );
1061 /* Mark link as "closing" */
1062 Conn_OPTION_ADD( &My_Connections[Idx], CONN_ISCLOSING );
1064 port = ng_ipaddr_getport(&My_Connections[Idx].addr);
1065 Log(LOG_INFO, "Shutting down connection %d (%s) with %s:%d ...", Idx,
1066 LogMsg ? LogMsg : FwdMsg, My_Connections[Idx].host, port);
1068 /* Search client, if any */
1069 c = Conn_GetClient( Idx );
1071 /* Should the client be informed? */
1074 /* Send statistics to client if registered as user: */
1075 if ((c != NULL) && (Client_Type(c) == CLIENT_USER)) {
1077 ":%s NOTICE %s :%sConnection statistics: client %.1f kb, server %.1f kb.",
1078 Client_ID(Client_ThisServer()), Client_ID(c),
1080 (double)My_Connections[Idx].bytes_in / 1024,
1081 (double)My_Connections[Idx].bytes_out / 1024);
1084 /* Send ERROR to client (see RFC 2812, section 3.1.7) */
1086 Conn_WriteStr(Idx, "ERROR :%s", FwdMsg);
1088 Conn_WriteStr(Idx, "ERROR :Closing connection");
1091 /* Try to write out the write buffer. Note: Handle_Write() eventually
1092 * removes the CLIENT structure associated with this connection if an
1093 * error occurs! So we have to re-check if there is still an valid
1094 * CLIENT structure after calling Handle_Write() ...*/
1095 (void)Handle_Write( Idx );
1097 /* Search client, if any (re-check!) */
1098 c = Conn_GetClient( Idx );
1100 if ( Conn_OPTION_ISSET( &My_Connections[Idx], CONN_SSL )) {
1101 Log(LOG_INFO, "SSL connection %d shutting down ...", Idx);
1102 ConnSSL_Free(&My_Connections[Idx]);
1105 /* Shut down socket */
1106 if (! io_close(My_Connections[Idx].sock)) {
1107 /* Oops, we can't close the socket!? This is ... ugly! */
1109 "Error closing connection %d (socket %d) with %s:%d - %s! (ignored)",
1110 Idx, My_Connections[Idx].sock, My_Connections[Idx].host,
1111 port, strerror(errno));
1114 /* Mark socket as invalid: */
1115 My_Connections[Idx].sock = NONE;
1117 /* If there is still a client, unregister it now */
1119 Client_Destroy(c, LogMsg, FwdMsg, true);
1121 /* Calculate statistics and log information */
1122 in_k = (double)My_Connections[Idx].bytes_in / 1024;
1123 out_k = (double)My_Connections[Idx].bytes_out / 1024;
1125 if (Conn_OPTION_ISSET( &My_Connections[Idx], CONN_ZIP)) {
1126 in_z_k = (double)My_Connections[Idx].zip.bytes_in / 1024;
1127 out_z_k = (double)My_Connections[Idx].zip.bytes_out / 1024;
1128 /* Make sure that no division by zero can occur during
1129 * the calculation of in_p and out_p: in_z_k and out_z_k
1130 * are non-zero, that's guaranteed by the protocol until
1131 * compression can be enabled. */
1136 in_p = (int)(( in_k * 100 ) / in_z_k );
1137 out_p = (int)(( out_k * 100 ) / out_z_k );
1139 "Connection %d with %s:%d closed (in: %.1fk/%.1fk/%d%%, out: %.1fk/%.1fk/%d%%).",
1140 Idx, My_Connections[Idx].host, port,
1141 in_k, in_z_k, in_p, out_k, out_z_k, out_p);
1147 "Connection %d with %s:%d closed (in: %.1fk, out: %.1fk).",
1148 Idx, My_Connections[Idx].host, port,
1152 /* Servers: Modify time of next connect attempt? */
1153 Conf_UnsetServer( Idx );
1156 /* Clean up zlib, if link was compressed */
1157 if ( Conn_OPTION_ISSET( &My_Connections[Idx], CONN_ZIP )) {
1158 inflateEnd( &My_Connections[Idx].zip.in );
1159 deflateEnd( &My_Connections[Idx].zip.out );
1160 array_free(&My_Connections[Idx].zip.rbuf);
1161 array_free(&My_Connections[Idx].zip.wbuf);
1165 array_free(&My_Connections[Idx].rbuf);
1166 array_free(&My_Connections[Idx].wbuf);
1167 if (My_Connections[Idx].pwd != NULL)
1168 free(My_Connections[Idx].pwd);
1170 /* Clean up connection structure (=free it) */
1171 Init_Conn_Struct( Idx );
1173 assert(NumConnections > 0);
1176 LogDebug("Shutdown of connection %d completed, %ld connection%s left.",
1177 Idx, NumConnections, NumConnections != 1 ? "s" : "");
1182 * Get current number of connections.
1184 * @returns Number of current connections.
1189 return NumConnections;
1194 * Get number of maximum simultaneous connections.
1196 * @returns Number of maximum simultaneous connections.
1201 return NumConnectionsMax;
1202 } /* Conn_CountMax */
1206 * Get number of connections accepted since the daemon startet.
1208 * @returns Number of connections accepted.
1211 Conn_CountAccepted(void)
1213 return NumConnectionsAccepted;
1214 } /* Conn_CountAccepted */
1218 * Synchronize established connections and configured server structures
1219 * after a configuration update and store the correct connection IDs, if any.
1222 Conn_SyncServerStruct(void)
1228 for (i = 0; i < Pool_Size; i++) {
1229 if (My_Connections[i].sock == NONE)
1233 client = Conn_GetClient(i);
1234 if (!client || Client_Type(client) != CLIENT_SERVER)
1237 for (c = 0; c < MAX_SERVERS; c++) {
1238 /* Configured server? */
1239 if (!Conf_Server[c].host[0])
1242 if (strcasecmp(Conf_Server[c].name, Client_ID(client)) == 0)
1243 Conf_Server[c].conn_id = i;
1246 } /* SyncServerStruct */
1250 * Get IP address string of a connection.
1252 * @param Idx Connection index.
1253 * @return Pointer to a global buffer containing the IP address as string.
1256 Conn_GetIPAInfo(CONN_ID Idx)
1259 return ng_ipaddr_tostr(&My_Connections[Idx].addr);
1264 * Send out data of write buffer; connect new sockets.
1266 * @param Idx Connection index.
1267 * @returns true on success, false otherwise.
1270 Handle_Write( CONN_ID Idx )
1275 assert( Idx > NONE );
1276 if ( My_Connections[Idx].sock < 0 ) {
1277 LogDebug("Handle_Write() on closed socket, connection %d", Idx);
1280 assert( My_Connections[Idx].sock > NONE );
1282 wdatalen = array_bytes(&My_Connections[Idx].wbuf );
1285 if (wdatalen == 0) {
1286 /* Write buffer is empty, so we try to flush the compression
1287 * buffer and get some data to work with from there :-) */
1288 if (!Zip_Flush(Idx))
1291 /* Now the write buffer most probably has changed: */
1292 wdatalen = array_bytes(&My_Connections[Idx].wbuf);
1296 if (wdatalen == 0) {
1297 /* Still no data, fine. */
1298 io_event_del(My_Connections[Idx].sock, IO_WANTWRITE );
1304 ("Handle_Write() called for connection %d, %ld bytes pending ...",
1309 if ( Conn_OPTION_ISSET( &My_Connections[Idx], CONN_SSL )) {
1310 len = ConnSSL_Write(&My_Connections[Idx], array_start(&My_Connections[Idx].wbuf), wdatalen);
1314 len = write(My_Connections[Idx].sock,
1315 array_start(&My_Connections[Idx].wbuf), wdatalen );
1318 if (errno == EAGAIN || errno == EINTR)
1321 Log(LOG_ERR, "Write error on connection %d (socket %d): %s!",
1322 Idx, My_Connections[Idx].sock, strerror(errno));
1323 Conn_Close(Idx, "Write error!", NULL, false);
1327 /* move any data not yet written to beginning */
1328 array_moveleft(&My_Connections[Idx].wbuf, 1, (size_t)len);
1331 } /* Handle_Write */
1335 * Count established connections to a specific IP address.
1337 * @returns Number of established connections.
1340 Count_Connections(ng_ipaddr_t *a)
1345 for (i = 0; i < Pool_Size; i++) {
1346 if (My_Connections[i].sock <= NONE)
1348 if (ng_ipaddr_ipequal(&My_Connections[i].addr, a))
1352 } /* Count_Connections */
1356 * Initialize new client connection on a listening socket.
1358 * @param Sock Listening socket descriptor.
1359 * @returns Accepted socket descriptor or -1 on error.
1362 New_Connection(int Sock)
1365 struct request_info req;
1367 ng_ipaddr_t new_addr;
1368 char ip_str[NG_INET_ADDRSTRLEN];
1369 int new_sock, new_sock_len, identsock;
1373 assert(Sock > NONE);
1375 LogDebug("Accepting new connection on socket %d ...", Sock);
1377 new_sock_len = (int)sizeof(new_addr);
1378 new_sock = accept(Sock, (struct sockaddr *)&new_addr,
1379 (socklen_t *)&new_sock_len);
1381 Log(LOG_CRIT, "Can't accept connection: %s!", strerror(errno));
1384 NumConnectionsAccepted++;
1386 if (!ng_ipaddr_tostr_r(&new_addr, ip_str)) {
1387 Log(LOG_CRIT, "fd %d: Can't convert IP address!", new_sock);
1388 Simple_Message(new_sock, "ERROR :Internal Server Error");
1394 /* Validate socket using TCP Wrappers */
1395 request_init(&req, RQ_DAEMON, PACKAGE_NAME, RQ_FILE, new_sock,
1396 RQ_CLIENT_SIN, &new_addr, NULL);
1398 if (!hosts_access(&req)) {
1400 "Refused connection from %s (by TCP Wrappers)!", ip_str);
1401 Simple_Message(new_sock, "ERROR :Connection refused");
1407 if (!Init_Socket(new_sock))
1410 /* Check global connection limit */
1411 if ((Conf_MaxConnections > 0) &&
1412 (NumConnections >= (size_t) Conf_MaxConnections)) {
1413 Log(LOG_ALERT, "Can't accept connection: limit (%d) reached!",
1414 Conf_MaxConnections);
1415 Simple_Message(new_sock, "ERROR :Connection limit reached");
1420 /* Check IP-based connection limit */
1421 cnt = Count_Connections(&new_addr);
1422 if ((Conf_MaxConnectionsIP > 0) && (cnt >= Conf_MaxConnectionsIP)) {
1423 /* Access denied, too many connections from this IP address! */
1425 "Refused connection from %s: too may connections (%ld) from this IP address!",
1427 Simple_Message(new_sock,
1428 "ERROR :Connection refused, too many connections from your IP address");
1433 if (new_sock >= Pool_Size) {
1434 if (!array_alloc(&My_ConnArray, sizeof(CONNECTION),
1435 (size_t) new_sock)) {
1437 "Can't allocate memory! [New_Connection]");
1438 Simple_Message(new_sock, "ERROR: Internal error");
1442 LogDebug("Bumped connection pool to %ld items (internal: %ld items, %ld bytes)",
1443 new_sock, array_length(&My_ConnArray,
1444 sizeof(CONNECTION)), array_bytes(&My_ConnArray));
1446 /* Adjust pointer to new block */
1447 My_Connections = array_start(&My_ConnArray);
1448 while (Pool_Size <= new_sock)
1449 Init_Conn_Struct(Pool_Size++);
1452 /* register callback */
1453 if (!io_event_create(new_sock, IO_WANTREAD, cb_clientserver)) {
1455 "Can't accept connection: io_event_create failed!");
1456 Simple_Message(new_sock, "ERROR :Internal error");
1461 c = Client_NewLocal(new_sock, NULL, CLIENT_UNKNOWN, false);
1464 "Can't accept connection: can't create client structure!");
1465 Simple_Message(new_sock, "ERROR :Internal error");
1470 Init_Conn_Struct(new_sock);
1471 My_Connections[new_sock].sock = new_sock;
1472 My_Connections[new_sock].addr = new_addr;
1473 My_Connections[new_sock].client = c;
1475 /* Set initial hostname to IP address. This becomes overwritten when
1476 * the DNS lookup is enabled and succeeds, but is used otherwise. */
1477 if (ng_ipaddr_af(&new_addr) != AF_INET)
1478 snprintf(My_Connections[new_sock].host,
1479 sizeof(My_Connections[new_sock].host), "[%s]", ip_str);
1481 strlcpy(My_Connections[new_sock].host, ip_str,
1482 sizeof(My_Connections[new_sock].host));
1484 Client_SetHostname(c, My_Connections[new_sock].host);
1486 Log(LOG_INFO, "Accepted connection %d from %s:%d on socket %d.",
1487 new_sock, My_Connections[new_sock].host,
1488 ng_ipaddr_getport(&new_addr), Sock);
1490 identsock = new_sock;
1496 if (Conf_NoticeAuth) {
1499 (void)Conn_WriteStr(new_sock,
1500 "NOTICE AUTH :*** Looking up your hostname and checking ident");
1503 (void)Conn_WriteStr(new_sock,
1504 "NOTICE AUTH :*** Looking up your hostname");
1506 Resolve_Addr(&My_Connections[new_sock].proc_stat, &new_addr,
1507 identsock, cb_Read_Resolver_Result);
1510 Account_Connection();
1512 } /* New_Connection */
1516 * Update global connection counters.
1519 Account_Connection(void)
1522 if (NumConnections > NumConnectionsMax)
1523 NumConnectionsMax = NumConnections;
1524 LogDebug("Total number of connections now %lu (max %lu).",
1525 NumConnections, NumConnectionsMax);
1526 } /* Account_Connection */
1530 * Translate socket handle into connection index.
1532 * @param Sock Socket handle.
1533 * @returns Connecion index or NONE, if no connection could be found.
1536 Socket2Index( int Sock )
1538 assert( Sock >= 0 );
1540 if( Sock >= Pool_Size || My_Connections[Sock].sock != Sock ) {
1541 /* the Connection was already closed again, likely due to
1543 LogDebug("Socket2Index: can't get connection for socket %d!", Sock);
1547 } /* Socket2Index */
1551 * Read data from the network to the read buffer. If an error occures,
1552 * the socket of this connection will be shut down.
1554 * @param Idx Connection index.
1557 Read_Request( CONN_ID Idx )
1560 static const unsigned int maxbps = COMMAND_LEN / 2;
1561 char readbuf[READBUFFER_LEN];
1564 assert( Idx > NONE );
1565 assert( My_Connections[Idx].sock > NONE );
1568 if ((array_bytes(&My_Connections[Idx].rbuf) >= READBUFFER_LEN) ||
1569 (array_bytes(&My_Connections[Idx].zip.rbuf) >= READBUFFER_LEN))
1571 if (array_bytes(&My_Connections[Idx].rbuf) >= READBUFFER_LEN)
1574 /* Read buffer is full */
1576 "Receive buffer space exhausted (connection %d): %d bytes",
1577 Idx, array_bytes(&My_Connections[Idx].rbuf));
1578 Conn_Close(Idx, "Receive buffer space exhausted", NULL, false);
1583 if (Conn_OPTION_ISSET(&My_Connections[Idx], CONN_SSL))
1584 len = ConnSSL_Read( &My_Connections[Idx], readbuf, sizeof(readbuf));
1587 len = read(My_Connections[Idx].sock, readbuf, sizeof(readbuf));
1589 Log(LOG_INFO, "%s:%u (%s) is closing the connection ...",
1590 My_Connections[Idx].host,
1591 (unsigned int) ng_ipaddr_getport(&My_Connections[Idx].addr),
1592 ng_ipaddr_tostr(&My_Connections[Idx].addr));
1594 "Socket closed!", "Client closed connection",
1600 if( errno == EAGAIN ) return;
1601 Log(LOG_ERR, "Read error on connection %d (socket %d): %s!",
1602 Idx, My_Connections[Idx].sock, strerror(errno));
1603 Conn_Close(Idx, "Read error!", "Client closed connection",
1608 if (Conn_OPTION_ISSET(&My_Connections[Idx], CONN_ZIP)) {
1609 if (!array_catb(&My_Connections[Idx].zip.rbuf, readbuf,
1612 "Could not append received data to zip input buffer (connection %d): %d bytes!",
1614 Conn_Close(Idx, "Receive buffer space exhausted", NULL,
1621 if (!array_catb( &My_Connections[Idx].rbuf, readbuf, len)) {
1623 "Could not append received data to input buffer (connection %d): %d bytes!",
1625 Conn_Close(Idx, "Receive buffer space exhausted", NULL, false );
1629 /* Update connection statistics */
1630 My_Connections[Idx].bytes_in += len;
1631 My_Connections[Idx].bps += Handle_Buffer(Idx);
1633 /* Make sure that there is still a valid client registered */
1634 c = Conn_GetClient(Idx);
1638 /* Update timestamp of last data received if this connection is
1639 * registered as a user, server or service connection. Don't update
1640 * otherwise, so users have at least Conf_PongTimeout seconds time to
1641 * register with the IRC server -- see Check_Connections().
1642 * Update "lastping", too, if time shifted backwards ... */
1643 if (Client_Type(c) == CLIENT_USER
1644 || Client_Type(c) == CLIENT_SERVER
1645 || Client_Type(c) == CLIENT_SERVICE) {
1647 if (My_Connections[Idx].lastdata != t)
1648 My_Connections[Idx].bps = 0;
1650 My_Connections[Idx].lastdata = t;
1651 if (My_Connections[Idx].lastping > t)
1652 My_Connections[Idx].lastping = t;
1655 /* Look at the data in the (read-) buffer of this connection */
1656 if (Client_Type(c) != CLIENT_SERVER
1657 && Client_Type(c) != CLIENT_UNKNOWNSERVER
1658 && Client_Type(c) != CLIENT_SERVICE
1659 && My_Connections[Idx].bps >= maxbps) {
1660 LogDebug("Throttling connection %d: BPS exceeded! (%u >= %u)",
1661 Idx, My_Connections[Idx].bps, maxbps);
1662 Conn_SetPenalty(Idx, 1);
1664 } /* Read_Request */
1668 * Handle all data in the connection read-buffer.
1670 * Data is processed until no complete command is left in the read buffer,
1671 * or MAX_COMMANDS[_SERVER|_SERVICE] commands were processed.
1672 * When a fatal error occurs, the connection is shut down.
1674 * @param Idx Index of the connection.
1675 * @returns Number of bytes processed.
1678 Handle_Buffer(CONN_ID Idx)
1681 char *ptr1, *ptr2, *first_eol;
1689 unsigned int i, maxcmd = MAX_COMMANDS, len_processed = 0;
1692 c = Conn_GetClient(Idx);
1693 starttime = time(NULL);
1697 /* Servers get special command limits that depend on the user count */
1698 switch (Client_Type(c)) {
1700 maxcmd = (int)(Client_UserCount() / 5)
1701 + MAX_COMMANDS_SERVER_MIN;
1702 /* Allow servers to handle even more commands while peering
1703 * to speed up server login and network synchronisation. */
1704 if (Conn_LastPing(Idx) == 0)
1707 case CLIENT_SERVICE:
1708 maxcmd = MAX_COMMANDS_SERVICE; break;
1711 for (i=0; i < maxcmd; i++) {
1713 if (My_Connections[Idx].delaytime > starttime)
1716 /* Unpack compressed data, if compression is in use */
1717 if (Conn_OPTION_ISSET(&My_Connections[Idx], CONN_ZIP)) {
1718 /* When unzipping fails, Unzip_Buffer() shuts
1719 * down the connection itself */
1720 if (!Unzip_Buffer(Idx))
1725 if (0 == array_bytes(&My_Connections[Idx].rbuf))
1728 /* Make sure that the buffer is NULL terminated */
1729 if (!array_cat0_temporary(&My_Connections[Idx].rbuf)) {
1730 Conn_Close(Idx, NULL,
1731 "Can't allocate memory [Handle_Buffer]",
1736 /* RFC 2812, section "2.3 Messages", 5th paragraph:
1737 * "IRC messages are always lines of characters terminated
1738 * with a CR-LF (Carriage Return - Line Feed) pair [...]". */
1740 ptr = strstr(array_start(&My_Connections[Idx].rbuf), "\r\n");
1743 /* Check for non-RFC-compliant request (only CR or LF)?
1744 * Unfortunately, there are quite a few clients out there
1745 * that do this -- e. g. mIRC, BitchX, and Trillian :-( */
1746 ptr1 = strchr(array_start(&My_Connections[Idx].rbuf), '\r');
1747 ptr2 = strchr(array_start(&My_Connections[Idx].rbuf), '\n');
1749 /* Check if there is a single CR or LF _before_ the
1750 * corerct CR+LF line terminator: */
1751 first_eol = ptr1 < ptr2 ? ptr1 : ptr2;
1752 if (first_eol < ptr) {
1753 /* Single CR or LF before CR+LF found */
1757 } else if (ptr1 || ptr2) {
1758 /* No CR+LF terminated command found, but single
1759 * CR or LF found ... */
1761 ptr = ptr1 < ptr2 ? ptr1 : ptr2;
1763 ptr = ptr1 ? ptr1 : ptr2;
1771 /* Complete (=line terminated) request found, handle it! */
1774 len = ptr - (char *)array_start(&My_Connections[Idx].rbuf) + delta;
1776 if (len > (COMMAND_LEN - 1)) {
1777 /* Request must not exceed 512 chars (incl. CR+LF!),
1778 * see RFC 2812. Disconnect Client if this happens. */
1780 "Request too long (connection %d): %d bytes (max. %d expected)!",
1781 Idx, array_bytes(&My_Connections[Idx].rbuf),
1783 Conn_Close(Idx, NULL, "Request too long", true);
1787 len_processed += (unsigned int)len;
1789 /* Request is empty (only '\r\n', '\r' or '\n');
1790 * delta is 2 ('\r\n') or 1 ('\r' or '\n'), see above */
1791 array_moveleft(&My_Connections[Idx].rbuf, 1, len);
1795 /* remember if stream is already compressed */
1796 old_z = My_Connections[Idx].options & CONN_ZIP;
1799 My_Connections[Idx].msg_in++;
1801 (Idx, (char *)array_start(&My_Connections[Idx].rbuf)))
1802 return 0; /* error -> connection has been closed */
1804 array_moveleft(&My_Connections[Idx].rbuf, 1, len);
1806 LogDebug("Connection %d: %d bytes left in read buffer.",
1807 Idx, array_bytes(&My_Connections[Idx].rbuf));
1810 if ((!old_z) && (My_Connections[Idx].options & CONN_ZIP) &&
1811 (array_bytes(&My_Connections[Idx].rbuf) > 0)) {
1812 /* The last command activated socket compression.
1813 * Data that was read after that needs to be copied
1814 * to the unzip buffer for decompression: */
1816 (&My_Connections[Idx].zip.rbuf,
1817 &My_Connections[Idx].rbuf)) {
1818 Conn_Close(Idx, NULL,
1819 "Can't allocate memory [Handle_Buffer]",
1824 array_trunc(&My_Connections[Idx].rbuf);
1826 ("Moved already received data (%u bytes) to uncompression buffer.",
1827 array_bytes(&My_Connections[Idx].zip.rbuf));
1831 return len_processed;
1832 } /* Handle_Buffer */
1836 * Check whether established connections are still alive or not.
1837 * If not, play PING-PONG first; and if that doesn't help either,
1838 * disconnect the respective peer.
1841 Check_Connections(void)
1847 for (i = 0; i < Pool_Size; i++) {
1848 if (My_Connections[i].sock < 0)
1851 c = Conn_GetClient(i);
1852 if (c && ((Client_Type(c) == CLIENT_USER)
1853 || (Client_Type(c) == CLIENT_SERVER)
1854 || (Client_Type(c) == CLIENT_SERVICE))) {
1855 /* connected User, Server or Service */
1856 if (My_Connections[i].lastping >
1857 My_Connections[i].lastdata) {
1858 /* We already sent a ping */
1859 if (My_Connections[i].lastping <
1860 time(NULL) - Conf_PongTimeout) {
1863 ("Connection %d: Ping timeout: %d seconds.",
1864 i, Conf_PongTimeout);
1865 snprintf(msg, sizeof(msg), "Ping timeout: %d seconds", Conf_PongTimeout);
1866 Conn_Close(i, NULL, msg, true);
1868 } else if (My_Connections[i].lastdata <
1869 time(NULL) - Conf_PingTimeout) {
1870 /* We need to send a PING ... */
1871 LogDebug("Connection %d: sending PING ...", i);
1873 Conn_WriteStr(i, "PING :%s",
1874 Client_ID(Client_ThisServer()));
1877 /* The connection is not fully established yet, so
1878 * we don't do the PING-PONG game here but instead
1879 * disconnect the client after "a short time" if it's
1880 * still not registered. */
1882 if (My_Connections[i].lastdata <
1883 time(NULL) - Conf_PongTimeout) {
1885 ("Unregistered connection %d timed out ...",
1887 Conn_Close(i, NULL, "Timeout", false);
1891 } /* Check_Connections */
1895 * Check if further server links should be established.
1903 time_now = time(NULL);
1905 /* Check all configured servers */
1906 for (i = 0; i < MAX_SERVERS; i++) {
1907 if (Conf_Server[i].conn_id != NONE)
1908 continue; /* Already establishing or connected */
1909 if (!Conf_Server[i].host[0] || !Conf_Server[i].port > 0)
1910 continue; /* No host and/or port configured */
1911 if (Conf_Server[i].flags & CONF_SFLAG_DISABLED)
1912 continue; /* Disabled configuration entry */
1913 if (Conf_Server[i].lasttry > (time_now - Conf_ConnectRetry))
1914 continue; /* We have to wait a little bit ... */
1916 /* Is there already a connection in this group? */
1917 if (Conf_Server[i].group > NONE) {
1918 for (n = 0; n < MAX_SERVERS; n++) {
1921 if ((Conf_Server[n].conn_id != NONE) &&
1922 (Conf_Server[n].group == Conf_Server[i].group))
1925 if (n < MAX_SERVERS)
1929 /* Okay, try to connect now */
1931 "Preparing to establish a new server link for \"%s\" ...",
1932 Conf_Server[i].name);
1933 Conf_Server[i].lasttry = time_now;
1934 Conf_Server[i].conn_id = SERVER_WAIT;
1935 assert(Proc_GetPipeFd(&Conf_Server[i].res_stat) < 0);
1936 Resolve_Name(&Conf_Server[i].res_stat, Conf_Server[i].host,
1937 cb_Connect_to_Server);
1939 } /* Check_Servers */
1943 * Establish a new outgoing server connection.
1945 * @param Server Configuration index of the server.
1946 * @param dest Destination IP address to connect to.
1949 New_Server( int Server , ng_ipaddr_t *dest)
1951 /* Establish new server link */
1952 char ip_str[NG_INET_ADDRSTRLEN];
1953 int af_dest, res, new_sock;
1956 assert( Server > NONE );
1958 /* Make sure that the remote server hasn't re-linked to this server
1959 * asynchronously on its own */
1960 if (Conf_Server[Server].conn_id > NONE) {
1962 "Connection to \"%s\" meanwhile re-established, aborting preparation.");
1966 if (!ng_ipaddr_tostr_r(dest, ip_str)) {
1967 Log(LOG_WARNING, "New_Server: Could not convert IP to string");
1971 af_dest = ng_ipaddr_af(dest);
1972 new_sock = socket(af_dest, SOCK_STREAM, 0);
1975 "Establishing connection for \"%s\" to \"%s:%d\" (%s), socket %d ...",
1976 Conf_Server[Server].name, Conf_Server[Server].host,
1977 Conf_Server[Server].port, ip_str, new_sock);
1980 Log(LOG_CRIT, "Can't create socket (af %d): %s!",
1981 af_dest, strerror(errno));
1985 if (!Init_Socket(new_sock))
1988 /* is a bind address configured? */
1989 res = ng_ipaddr_af(&Conf_Server[Server].bind_addr);
1990 /* if yes, bind now. If it fails, warn and let connect() pick a source address */
1991 if (res && bind(new_sock, (struct sockaddr *) &Conf_Server[Server].bind_addr,
1992 ng_ipaddr_salen(&Conf_Server[Server].bind_addr)))
1994 ng_ipaddr_tostr_r(&Conf_Server[Server].bind_addr, ip_str);
1995 Log(LOG_WARNING, "Can't bind socket to %s: %s!", ip_str, strerror(errno));
1997 ng_ipaddr_setport(dest, Conf_Server[Server].port);
1998 res = connect(new_sock, (struct sockaddr *) dest, ng_ipaddr_salen(dest));
1999 if(( res != 0 ) && ( errno != EINPROGRESS )) {
2000 Log( LOG_CRIT, "Can't connect socket: %s!", strerror( errno ));
2005 if (!array_alloc(&My_ConnArray, sizeof(CONNECTION), (size_t)new_sock)) {
2007 "Cannot allocate memory for server connection (socket %d)",
2013 if (!io_event_create( new_sock, IO_WANTWRITE, cb_connserver)) {
2014 Log(LOG_ALERT, "io_event_create(): could not add fd %d", strerror(errno));
2019 My_Connections = array_start(&My_ConnArray);
2021 assert(My_Connections[new_sock].sock <= 0);
2023 Init_Conn_Struct(new_sock);
2025 ng_ipaddr_tostr_r(dest, ip_str);
2026 c = Client_NewLocal(new_sock, ip_str, CLIENT_UNKNOWNSERVER, false);
2028 Log( LOG_ALERT, "Can't establish connection: can't create client structure!" );
2033 /* Conn_Close() decrements this counter again */
2034 Account_Connection();
2035 Client_SetIntroducer( c, c );
2036 Client_SetToken( c, TOKEN_OUTBOUND );
2038 /* Register connection */
2039 Conf_SetServer(Server, new_sock);
2040 My_Connections[new_sock].sock = new_sock;
2041 My_Connections[new_sock].addr = *dest;
2042 My_Connections[new_sock].client = c;
2043 strlcpy( My_Connections[new_sock].host, Conf_Server[Server].host,
2044 sizeof(My_Connections[new_sock].host ));
2047 if (Conf_Server[Server].SSLConnect && !ConnSSL_PrepareConnect( &My_Connections[new_sock],
2048 &Conf_Server[Server] ))
2050 Log(LOG_ALERT, "Could not initialize SSL for outgoing connection");
2051 Conn_Close( new_sock, "Could not initialize SSL for outgoing connection", NULL, false );
2052 Init_Conn_Struct( new_sock );
2053 Conf_Server[Server].conn_id = NONE;
2057 LogDebug("Registered new connection %d on socket %d (%ld in total).",
2058 new_sock, My_Connections[new_sock].sock, NumConnections);
2059 Conn_OPTION_ADD( &My_Connections[new_sock], CONN_ISCONNECTING );
2064 * Initialize connection structure.
2066 * @param Idx Connection index.
2069 Init_Conn_Struct(CONN_ID Idx)
2071 time_t now = time(NULL);
2073 memset(&My_Connections[Idx], 0, sizeof(CONNECTION));
2074 My_Connections[Idx].sock = -1;
2075 My_Connections[Idx].signon = now;
2076 My_Connections[Idx].lastdata = now;
2077 My_Connections[Idx].lastprivmsg = now;
2078 Proc_InitStruct(&My_Connections[Idx].proc_stat);
2079 } /* Init_Conn_Struct */
2083 * Initialize options of a new socket.
2085 * For example, we try to set socket options SO_REUSEADDR and IPTOS_LOWDELAY.
2086 * The socket is automatically closed if a fatal error is encountered.
2088 * @param Sock Socket handle.
2089 * @returns false if socket was closed due to fatal error.
2092 Init_Socket( int Sock )
2096 if (!io_setnonblock(Sock)) {
2097 Log( LOG_CRIT, "Can't enable non-blocking mode for socket: %s!", strerror( errno ));
2102 /* Don't block this port after socket shutdown */
2104 if( setsockopt( Sock, SOL_SOCKET, SO_REUSEADDR, &value, (socklen_t)sizeof( value )) != 0 )
2106 Log( LOG_ERR, "Can't set socket option SO_REUSEADDR: %s!", strerror( errno ));
2107 /* ignore this error */
2110 /* Set type of service (TOS) */
2111 #if defined(IPPROTO_IP) && defined(IPTOS_LOWDELAY)
2112 value = IPTOS_LOWDELAY;
2113 if (setsockopt(Sock, IPPROTO_IP, IP_TOS, &value,
2114 (socklen_t) sizeof(value))) {
2115 LogDebug("Can't set socket option IP_TOS: %s!",
2117 /* ignore this error */
2119 LogDebug("IP_TOS on socket %d has been set to IPTOS_LOWDELAY.",
2128 * Read results of a resolver sub-process and try to initiate a new server
2131 * @param fd File descriptor of the pipe to the sub-process.
2132 * @param events (ignored IO specification)
2135 cb_Connect_to_Server(int fd, UNUSED short events)
2137 /* Read result of resolver sub-process from pipe and start connection */
2140 ng_ipaddr_t dest_addrs[4]; /* we can handle at most 3; but we read up to
2141 four so we can log the 'more than we can handle'
2142 condition. First result is tried immediately, rest
2143 is saved for later if needed. */
2145 LogDebug("Resolver: Got forward lookup callback on fd %d, events %d", fd, events);
2147 for (i=0; i < MAX_SERVERS; i++) {
2148 if (Proc_GetPipeFd(&Conf_Server[i].res_stat) == fd )
2152 if( i >= MAX_SERVERS) {
2153 /* Ops, no matching server found?! */
2155 LogDebug("Resolver: Got Forward Lookup callback for unknown server!?");
2159 /* Read result from pipe */
2160 len = Proc_Read(&Conf_Server[i].res_stat, dest_addrs, sizeof(dest_addrs));
2161 Proc_Close(&Conf_Server[i].res_stat);
2163 /* Error resolving hostname: reset server structure */
2164 Conf_Server[i].conn_id = NONE;
2168 assert((len % sizeof(ng_ipaddr_t)) == 0);
2170 LogDebug("Got result from resolver: %u structs (%u bytes).", len/sizeof(ng_ipaddr_t), len);
2172 memset(&Conf_Server[i].dst_addr, 0, sizeof(Conf_Server[i].dst_addr));
2173 if (len > sizeof(ng_ipaddr_t)) {
2174 /* more than one address for this hostname, remember them
2175 * in case first address is unreachable/not available */
2176 len -= sizeof(ng_ipaddr_t);
2177 if (len > sizeof(Conf_Server[i].dst_addr)) {
2178 len = sizeof(Conf_Server[i].dst_addr);
2180 "Notice: Resolver returned more IP Addresses for host than we can handle, additional addresses dropped.");
2182 memcpy(&Conf_Server[i].dst_addr, &dest_addrs[1], len);
2185 New_Server(i, dest_addrs);
2186 } /* cb_Read_Forward_Lookup */
2190 * Read results of a resolver sub-process from the pipe and update the
2191 * apropriate connection/client structure(s): hostname and/or IDENT user name.
2193 * @param r_fd File descriptor of the pipe to the sub-process.
2194 * @param events (ignored IO specification)
2197 cb_Read_Resolver_Result( int r_fd, UNUSED short events )
2204 char readbuf[HOST_LEN + 2 + CLIENT_USER_LEN];
2207 char readbuf[HOST_LEN + 1];
2210 LogDebug("Resolver: Got callback on fd %d, events %d", r_fd, events );
2211 i = Conn_GetFromProc(r_fd);
2213 /* Ops, none found? Probably the connection has already
2214 * been closed!? We'll ignore that ... */
2216 LogDebug("Resolver: Got callback for unknown connection!?");
2220 /* Read result from pipe */
2221 len = Proc_Read(&My_Connections[i].proc_stat, readbuf, sizeof readbuf -1);
2222 Proc_Close(&My_Connections[i].proc_stat);
2226 readbuf[len] = '\0';
2227 identptr = strchr(readbuf, '\n');
2228 assert(identptr != NULL);
2230 Log( LOG_CRIT, "Resolver: Got malformed result!");
2235 LogDebug("Got result from resolver: \"%s\" (%u bytes read).", readbuf, len);
2236 /* Okay, we got a complete result: this is a host name for outgoing
2237 * connections and a host name and IDENT user name (if enabled) for
2238 * incoming connections.*/
2239 assert ( My_Connections[i].sock >= 0 );
2240 /* Incoming connection. Search client ... */
2241 c = Conn_GetClient( i );
2242 assert( c != NULL );
2244 /* Only update client information of unregistered clients.
2245 * Note: user commands (e. g. WEBIRC) are always read _after_ reading
2246 * the resolver results, so we don't have to worry to override settings
2247 * from these commands here. */
2248 if(Client_Type(c) == CLIENT_UNKNOWN) {
2249 strlcpy(My_Connections[i].host, readbuf,
2250 sizeof(My_Connections[i].host));
2251 Client_SetHostname(c, readbuf);
2252 if (Conf_NoticeAuth)
2253 (void)Conn_WriteStr(i,
2254 "NOTICE AUTH :*** Found your hostname");
2260 if ((*ptr < '0' || *ptr > '9') &&
2261 (*ptr < 'A' || *ptr > 'Z') &&
2262 (*ptr < 'a' || *ptr > 'z'))
2267 /* Erroneous IDENT reply */
2269 "Got invalid IDENT reply for connection %d! Ignored.",
2273 "IDENT lookup for connection %d: \"%s\".",
2275 Client_SetUser(c, identptr, true);
2277 if (Conf_NoticeAuth) {
2278 (void)Conn_WriteStr(i,
2279 "NOTICE AUTH :*** Got %sident response",
2280 *ptr ? "invalid " : "");
2283 Log(LOG_INFO, "IDENT lookup for connection %d: no result.", i);
2284 if (Conf_NoticeAuth && Conf_Ident)
2285 (void)Conn_WriteStr(i,
2286 "NOTICE AUTH :*** No ident response");
2289 Class_HandleServerBans(c);
2292 else Log( LOG_DEBUG, "Resolver: discarding result for already registered connection %d.", i );
2294 } /* cb_Read_Resolver_Result */
2298 * Write a "simple" (error) message to a socket.
2300 * The message is sent without using the connection write buffers, without
2301 * compression/encryption, and even without any error reporting. It is
2302 * designed for error messages of e.g. New_Connection().
2304 * @param Sock Socket handle.
2305 * @param Msg Message string to send.
2308 Simple_Message(int Sock, const char *Msg)
2310 char buf[COMMAND_LEN];
2313 assert(Sock > NONE);
2314 assert(Msg != NULL);
2316 strlcpy(buf, Msg, sizeof buf - 2);
2317 len = strlcat(buf, "\r\n", sizeof buf);
2318 if (write(Sock, buf, len) < 0) {
2319 /* Because this function most probably got called to log
2320 * an error message, any write error is ignored here to
2321 * avoid an endless loop. But casting the result of write()
2322 * to "void" doesn't satisfy the GNU C code attribute
2323 * "warn_unused_result" which is used by some versions of
2324 * glibc (e.g. 2.11.1), therefore this silly error
2325 * "handling" code here :-( */
2328 } /* Simple_Error */
2332 * Get CLIENT structure that belongs to a local connection identified by its
2333 * index number. Each connection belongs to a client by definition, so it is
2334 * not required that the caller checks for NULL return values.
2336 * @param Idx Connection index number.
2337 * @returns Pointer to CLIENT structure.
2340 Conn_GetClient( CONN_ID Idx )
2345 c = array_get(&My_ConnArray, sizeof (CONNECTION), (size_t)Idx);
2347 return c ? c->client : NULL;
2351 * Get PROC_STAT sub-process structure of a connection.
2353 * @param Idx Connection index number.
2354 * @returns PROC_STAT structure.
2357 Conn_GetProcStat(CONN_ID Idx)
2362 c = array_get(&My_ConnArray, sizeof (CONNECTION), (size_t)Idx);
2364 return &c->proc_stat;
2365 } /* Conn_GetProcStat */
2369 * Get CONN_ID from file descriptor associated to a subprocess structure.
2371 * @param fd File descriptor.
2372 * @returns CONN_ID or NONE (-1).
2375 Conn_GetFromProc(int fd)
2380 for (i = 0; i < Pool_Size; i++) {
2381 if ((My_Connections[i].sock != NONE)
2382 && (Proc_GetPipeFd(&My_Connections[i].proc_stat) == fd))
2386 } /* Conn_GetFromProc */
2392 Conn_GetAuthPing(CONN_ID Idx)
2394 assert (Idx != NONE);
2395 return My_Connections[Idx].auth_ping;
2396 } /* Conn_GetAuthPing */
2399 Conn_SetAuthPing(CONN_ID Idx, long ID)
2401 assert (Idx != NONE);
2402 My_Connections[Idx].auth_ping = ID;
2403 } /* Conn_SetAuthPing */
2411 * Get information about used SSL chiper.
2413 * @param Idx Connection index number.
2414 * @param buf Buffer for returned information text.
2415 * @param len Size of return buffer "buf".
2416 * @returns true on success, false otherwise.
2419 Conn_GetCipherInfo(CONN_ID Idx, char *buf, size_t len)
2423 assert(Idx < (int) array_length(&My_ConnArray, sizeof(CONNECTION)));
2424 return ConnSSL_GetCipherInfo(&My_Connections[Idx], buf, len);
2429 * Check if a connection is SSL-enabled or not.
2431 * @param Idx Connection index number.
2432 * @return true if connection is SSL-enabled, false otherwise.
2435 Conn_UsesSSL(CONN_ID Idx)
2439 assert(Idx < (int) array_length(&My_ConnArray, sizeof(CONNECTION)));
2440 return Conn_OPTION_ISSET(&My_Connections[Idx], CONN_SSL);
2449 * Dump internal state of the "connection module".
2452 Conn_DebugDump(void)
2456 Log(LOG_DEBUG, "Connection status:");
2457 for (i = 0; i < Pool_Size; i++) {
2458 if (My_Connections[i].sock == NONE)
2461 " - %d: host=%s, lastdata=%ld, lastping=%ld, delaytime=%ld, flag=%d, options=%d, bps=%d, client=%s",
2462 My_Connections[i].sock, My_Connections[i].host,
2463 My_Connections[i].lastdata, My_Connections[i].lastping,
2464 My_Connections[i].delaytime, My_Connections[i].flag,
2465 My_Connections[i].options, My_Connections[i].bps,
2466 My_Connections[i].client ? Client_ID(My_Connections[i].client) : "-");
2468 } /* Conn_DumpClients */