2 * ngIRCd -- The Next Generation IRC Daemon
3 * Copyright (c)2001-2013 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
85 #define SD_LISTEN_FDS_START 3
88 static bool Handle_Write PARAMS(( CONN_ID Idx ));
89 static bool Conn_Write PARAMS(( CONN_ID Idx, char *Data, size_t Len ));
90 static int New_Connection PARAMS(( int Sock, bool IsSSL ));
91 static CONN_ID Socket2Index PARAMS(( int Sock ));
92 static void Read_Request PARAMS(( CONN_ID Idx ));
93 static unsigned int Handle_Buffer PARAMS(( CONN_ID Idx ));
94 static void Check_Connections PARAMS(( void ));
95 static void Check_Servers PARAMS(( void ));
96 static void Init_Conn_Struct PARAMS(( CONN_ID Idx ));
97 static bool Init_Socket PARAMS(( int Sock ));
98 static void New_Server PARAMS(( int Server, ng_ipaddr_t *dest ));
99 static void Simple_Message PARAMS(( int Sock, const char *Msg ));
100 static int NewListener PARAMS(( const char *listen_addr, UINT16 Port ));
101 static void Account_Connection PARAMS((void));
104 static array My_Listeners;
105 static array My_ConnArray;
106 static size_t NumConnections, NumConnectionsMax, NumConnectionsAccepted;
109 int allow_severity = LOG_INFO;
110 int deny_severity = LOG_ERR;
113 static void server_login PARAMS((CONN_ID idx));
116 extern struct SSLOptions Conf_SSLOptions;
117 static void cb_connserver_login_ssl PARAMS((int sock, short what));
118 static void cb_clientserver_ssl PARAMS((int sock, short what));
120 static void cb_Read_Resolver_Result PARAMS((int sock, UNUSED short what));
121 static void cb_Connect_to_Server PARAMS((int sock, UNUSED short what));
122 static void cb_clientserver PARAMS((int sock, short what));
128 * Get number of sockets available from systemd(8).
130 * ngIRCd needs to implement its own sd_listen_fds(3) function and can't
131 * use the one provided by systemd itself, becaus the sockets will be
132 * used in a forked child process with a new PID, and this would trigger
133 * an error in the standard implementation.
135 * @return Number of sockets available, -1 if sockets have already been
136 * initialized, or 0 when no sockets have been passed.
139 my_sd_listen_fds(void)
144 /* Check if LISTEN_PID exists; but we ignore the result, because
145 * normally ngircd forks a child before checking this, and therefore
146 * the PID set in the environment is always wrong ... */
147 e = getenv("LISTEN_PID");
151 e = getenv("LISTEN_FDS");
155 unsetenv("LISTEN_FDS");
162 * IO callback for listening sockets: handle new connections. This callback
163 * gets called when a new non-SSL connection should be accepted.
165 * @param sock Socket descriptor.
166 * @param irrelevant (ignored IO specification)
169 cb_listen(int sock, short irrelevant)
172 (void) New_Connection(sock, false);
178 * IO callback for listening SSL sockets: handle new connections. This callback
179 * gets called when a new SSL-enabled connection should be accepted.
181 * @param sock Socket descriptor.
182 * @param irrelevant (ignored IO specification)
185 cb_listen_ssl(int sock, short irrelevant)
190 fd = New_Connection(sock, true);
193 io_event_setcb(My_Connections[fd].sock, cb_clientserver_ssl);
199 * IO callback for new outgoing non-SSL server connections.
201 * @param sock Socket descriptor.
202 * @param what IO specification (IO_WANTREAD/IO_WANTWRITE/...).
205 cb_connserver(int sock, UNUSED short what)
207 int res, err, server;
209 CONN_ID idx = Socket2Index( sock );
212 LogDebug("cb_connserver wants to write on unknown socket?!");
217 assert(what & IO_WANTWRITE);
219 /* Make sure that the server is still configured; it could have been
220 * removed in the meantime! */
221 server = Conf_GetServer(idx);
223 Log(LOG_ERR, "Connection on socket %d to \"%s\" aborted!",
224 sock, My_Connections[idx].host);
225 Conn_Close(idx, "Connection aborted!", NULL, false);
229 /* connect() finished, get result. */
230 sock_len = (socklen_t)sizeof(err);
231 res = getsockopt(My_Connections[idx].sock, SOL_SOCKET, SO_ERROR,
233 assert(sock_len == sizeof(err));
235 /* Error while connecting? */
236 if ((res != 0) || (err != 0)) {
238 Log(LOG_CRIT, "getsockopt (connection %d): %s!",
239 idx, strerror(errno));
242 "Can't connect socket to \"%s:%d\" (connection %d): %s!",
243 My_Connections[idx].host, Conf_Server[server].port,
246 Conn_Close(idx, "Can't connect", NULL, false);
248 if (ng_ipaddr_af(&Conf_Server[server].dst_addr[0])) {
249 /* more addresses to try... */
250 New_Server(server, &Conf_Server[server].dst_addr[0]);
251 /* connection to dst_addr[0] is now in progress, so
252 * remove this address... */
253 Conf_Server[server].dst_addr[0] =
254 Conf_Server[server].dst_addr[1];
255 memset(&Conf_Server[server].dst_addr[1], 0,
256 sizeof(Conf_Server[server].dst_addr[1]));
261 /* connect() succeeded, remove all additional addresses */
262 memset(&Conf_Server[server].dst_addr, 0,
263 sizeof(Conf_Server[server].dst_addr));
265 Conn_OPTION_DEL( &My_Connections[idx], CONN_ISCONNECTING );
267 if ( Conn_OPTION_ISSET( &My_Connections[idx], CONN_SSL_CONNECT )) {
268 io_event_setcb( sock, cb_connserver_login_ssl );
269 io_event_add( sock, IO_WANTWRITE|IO_WANTREAD );
278 * Login to a remote server.
280 * @param idx Connection index.
283 server_login(CONN_ID idx)
286 "Connection %d (socket %d) with \"%s:%d\" established. Now logging in ...",
287 idx, My_Connections[idx].sock, My_Connections[idx].host,
288 Conf_Server[Conf_GetServer(idx)].port);
290 io_event_setcb( My_Connections[idx].sock, cb_clientserver);
291 io_event_add( My_Connections[idx].sock, IO_WANTREAD|IO_WANTWRITE);
293 /* Send PASS and SERVER command to peer */
294 Conn_WriteStr( idx, "PASS %s %s", Conf_Server[Conf_GetServer( idx )].pwd_out, NGIRCd_ProtoID );
295 Conn_WriteStr( idx, "SERVER %s :%s", Conf_ServerName, Conf_ServerInfo );
301 * IO callback for new outgoing SSL-enabled server connections.
303 * @param sock Socket descriptor.
304 * @param unused (ignored IO specification)
307 cb_connserver_login_ssl(int sock, short unused)
309 CONN_ID idx = Socket2Index(sock);
317 switch (ConnSSL_Connect( &My_Connections[idx])) {
319 case 0: LogDebug("ConnSSL_Connect: not ready");
322 Log(LOG_ERR, "SSL connection on socket %d failed!", sock);
323 Conn_Close(idx, "Can't connect", NULL, false);
327 Log( LOG_INFO, "SSL connection %d with \"%s:%d\" established.", idx,
328 My_Connections[idx].host, Conf_Server[Conf_GetServer( idx )].port );
336 * IO callback for established non-SSL client and server connections.
338 * @param sock Socket descriptor.
339 * @param what IO specification (IO_WANTREAD/IO_WANTWRITE/...).
342 cb_clientserver(int sock, short what)
344 CONN_ID idx = Socket2Index(sock);
353 if (what & IO_WANTREAD
354 || (Conn_OPTION_ISSET(&My_Connections[idx], CONN_SSL_WANT_WRITE))) {
355 /* if TLS layer needs to write additional data, call
356 * Read_Request() instead so that SSL/TLS can continue */
360 if (what & IO_WANTREAD)
363 if (what & IO_WANTWRITE)
370 * IO callback for established SSL-enabled client and server connections.
372 * @param sock Socket descriptor.
373 * @param what IO specification (IO_WANTREAD/IO_WANTWRITE/...).
376 cb_clientserver_ssl(int sock, short what)
378 CONN_ID idx = Socket2Index(sock);
387 switch (ConnSSL_Accept(&My_Connections[idx])) {
391 return; /* EAGAIN: callback will be invoked again by IO layer */
393 Conn_Close(idx, "SSL accept error, closing socket", "SSL accept error", false);
396 if (what & IO_WANTREAD)
399 if (what & IO_WANTWRITE)
402 io_event_setcb(sock, cb_clientserver); /* SSL handshake completed */
408 * Initialize connecion module.
415 /* Speicher fuer Verbindungs-Pool anfordern */
416 Pool_Size = CONNECTION_POOL;
417 if ((Conf_MaxConnections > 0) &&
418 (Pool_Size > Conf_MaxConnections))
419 Pool_Size = Conf_MaxConnections;
421 if (!array_alloc(&My_ConnArray, sizeof(CONNECTION), (size_t)Pool_Size)) {
422 Log(LOG_EMERG, "Can't allocate memory! [Conn_Init]");
426 /* FIXME: My_Connetions/Pool_Size is needed by other parts of the
427 * code; remove them! */
428 My_Connections = (CONNECTION*) array_start(&My_ConnArray);
430 LogDebug("Allocated connection pool for %d items (%ld bytes).",
431 array_length(&My_ConnArray, sizeof(CONNECTION)),
432 array_bytes(&My_ConnArray));
434 assert(array_length(&My_ConnArray, sizeof(CONNECTION)) >= (size_t)Pool_Size);
436 array_free( &My_Listeners );
438 for (i = 0; i < Pool_Size; i++)
444 * Clean up connection module.
451 Conn_ExitListeners();
453 LogDebug("Shutting down all connections ..." );
454 for( idx = 0; idx < Pool_Size; idx++ ) {
455 if( My_Connections[idx].sock > NONE ) {
456 Conn_Close( idx, NULL, NGIRCd_SignalRestart ?
457 "Server going down (restarting)":"Server going down", true );
461 array_free(&My_ConnArray);
462 My_Connections = NULL;
464 io_library_shutdown();
469 * Close all sockets (file descriptors) of open connections.
470 * This is useful in forked child processes, for example, to make sure that
471 * they don't hold connections open that the main process wants to close.
474 Conn_CloseAllSockets(int ExceptOf)
478 for(idx = 0; idx < Pool_Size; idx++) {
479 if(My_Connections[idx].sock > NONE &&
480 My_Connections[idx].sock != ExceptOf)
481 close(My_Connections[idx].sock);
487 * Initialize listening ports.
489 * @param a Array containing the ports the daemon should listen on.
490 * @param listen_addr Address the socket should listen on (can be "0.0.0.0").
491 * @param func IO callback function to register.
492 * @returns Number of listening sockets created.
495 Init_Listeners(array *a, const char *listen_addr, void (*func)(int,short))
497 unsigned int created = 0;
502 len = array_length(a, sizeof (UINT16));
503 port = array_start(a);
505 fd = NewListener(listen_addr, *port);
510 if (!io_event_create( fd, IO_WANTREAD, func )) {
512 "io_event_create(): Can't add fd %d (port %u): %s!",
513 fd, (unsigned int) *port, strerror(errno));
526 * Initialize all listening sockets.
528 * @returns Number of created listening sockets
531 Conn_InitListeners( void )
533 /* Initialize ports on which the server should accept connections */
534 unsigned int created = 0;
535 char *af_str, *copy, *listen_addr;
536 int count, fd, i, addr_len;
539 assert(Conf_ListenAddress);
541 count = my_sd_listen_fds();
544 "Not re-initializing listening sockets of systemd(8) ...");
548 /* systemd(8) passed sockets to us, so don't try to initialize
549 * listening sockets on our own but use the passed ones */
550 LogDebug("Initializing %d systemd sockets ...", count);
551 for (i = 0; i < count; i++) {
552 fd = SD_LISTEN_FDS_START + i;
553 addr_len = (int)sizeof(addr);
554 getsockname(fd, (struct sockaddr *)&addr, (socklen_t*)&addr_len);
556 if (addr.sin4.sin_family != AF_INET && addr.sin4.sin_family != AF_INET6)
558 if (addr.sin4.sin_family != AF_INET)
561 /* Socket is of unsupported type! For example, systemd passed in
562 * an IPv6 socket but ngIRCd isn't compiled with IPv6 support. */
563 switch (addr.sin4.sin_family)
565 case AF_UNSPEC: af_str = "AF_UNSPEC"; break;
566 case AF_UNIX: af_str = "AF_UNIX"; break;
567 case AF_INET: af_str = "AF_INET"; break;
569 case AF_INET6: af_str = "AF_INET6"; break;
572 case AF_NETLINK: af_str = "AF_NETLINK"; break;
574 default: af_str = "unknown"; break;
577 "Socket %d is of unsupported type \"%s\" (%d), have to ignore it!",
578 fd, af_str, addr.sin4.sin_family);
584 if (!io_event_create(fd, IO_WANTREAD, cb_listen)) {
586 "io_event_create(): Can't add fd %d: %s!",
587 fd, strerror(errno));
591 "Initialized socket %d from systemd.", fd);
597 /* not using systemd socket activation, initialize listening sockets: */
599 /* can't use Conf_ListenAddress directly, see below */
600 copy = strdup(Conf_ListenAddress);
602 Log(LOG_CRIT, "Cannot copy %s: %s", Conf_ListenAddress,
606 listen_addr = strtok(copy, ",");
608 while (listen_addr) {
609 ngt_TrimStr(listen_addr);
611 created += Init_Listeners(&Conf_ListenPorts,
612 listen_addr, cb_listen);
614 created += Init_Listeners(&Conf_SSLOptions.ListenPorts,
615 listen_addr, cb_listen_ssl);
619 listen_addr = strtok(NULL, ",");
622 /* Can't free() Conf_ListenAddress here: on REHASH, if the config file
623 * cannot be re-loaded, we'd end up with a NULL Conf_ListenAddress.
624 * Instead, free() takes place in conf.c, before the config file
625 * is being parsed. */
629 } /* Conn_InitListeners */
633 * Shut down all listening sockets.
636 Conn_ExitListeners( void )
638 /* Close down all listening sockets */
642 /* Get number of listening sockets to shut down. There can be none
643 * if ngIRCd has been "socket activated" by systemd. */
644 arraylen = array_length(&My_Listeners, sizeof (int));
649 "Shutting down all listening sockets (%d total) ...", arraylen);
650 fd = array_start(&My_Listeners);
655 LogDebug("Listening socket %d closed.", *fd );
658 array_free(&My_Listeners);
659 } /* Conn_ExitListeners */
663 * Bind a socket to a specific (source) address.
665 * @param addr Address structure.
666 * @param listen_addrstr Source address as string.
667 * @param Port Port number.
668 * @returns true on success, false otherwise.
671 InitSinaddrListenAddr(ng_ipaddr_t *addr, const char *listen_addrstr, UINT16 Port)
675 ret = ng_ipaddr_init(addr, listen_addrstr, Port);
677 assert(listen_addrstr);
678 Log(LOG_CRIT, "Can't bind to [%s]:%u: can't convert ip address \"%s\"!",
679 listen_addrstr, Port, listen_addrstr);
686 * Set a socket to "IPv6 only". If the given socket doesn't belong to the
687 * AF_INET6 family, or the operating system doesn't support this functionality,
688 * this function retruns silently.
690 * @param af Address family of the socket.
691 * @param sock Socket handle.
694 set_v6_only(int af, int sock)
696 #if defined(IPV6_V6ONLY) && defined(WANT_IPV6)
702 if (setsockopt(sock, IPPROTO_IPV6, IPV6_V6ONLY, &on, (socklen_t)sizeof(on)))
703 Log(LOG_ERR, "Could not set IPV6_V6ONLY: %s", strerror(errno));
712 * Initialize new listening port.
714 * @param listen_addr Local address to bind the socet to (can be 0.0.0.0).
715 * @param Port Port number on which the new socket should be listening.
716 * @returns file descriptor of the socket or -1 on failure.
719 NewListener(const char *listen_addr, UINT16 Port)
721 /* Create new listening socket on specified port */
725 if (!InitSinaddrListenAddr(&addr, listen_addr, Port))
728 af = ng_ipaddr_af(&addr);
729 sock = socket(af, SOCK_STREAM, 0);
731 Log(LOG_CRIT, "Can't create socket (af %d) : %s!", af,
736 set_v6_only(af, sock);
738 if (!Init_Socket(sock))
741 if (bind(sock, (struct sockaddr *)&addr, ng_ipaddr_salen(&addr)) != 0) {
742 Log(LOG_CRIT, "Can't bind socket to address %s:%d - %s!",
743 ng_ipaddr_tostr(&addr), Port, strerror(errno));
748 if (listen(sock, 10) != 0) {
749 Log(LOG_CRIT, "Can't listen on socket: %s!", strerror(errno));
754 /* keep fd in list so we can close it when ngircd restarts/shuts down */
755 if (!array_catb(&My_Listeners, (char *)&sock, sizeof(int))) {
756 Log(LOG_CRIT, "Can't add socket to My_Listeners array: %s!",
762 Log(LOG_INFO, "Now listening on [%s]:%d (socket %d).",
763 ng_ipaddr_tostr(&addr), Port, sock);
771 * Check if SSL library needs to read SSL-protocol related data.
773 * SSL/TLS connections require extra treatment:
774 * When either CONN_SSL_WANT_WRITE or CONN_SSL_WANT_READ is set, we
775 * need to take care of that first, before checking read/write buffers.
776 * For instance, while we might have data in our write buffer, the
777 * TLS/SSL protocol might need to read internal data first for TLS/SSL
780 * If this function returns true, such a condition is met and we have
781 * to reverse the condition (check for read even if we've data to write,
782 * do not check for read but writeability even if write-buffer is empty).
784 * @param c Connection to check.
785 * @returns true if SSL-library has to read protocol data.
788 SSL_WantRead(const CONNECTION *c)
790 if (Conn_OPTION_ISSET(c, CONN_SSL_WANT_READ)) {
791 io_event_add(c->sock, IO_WANTREAD);
798 * Check if SSL library needs to write SSL-protocol related data.
800 * Please see description of SSL_WantRead() for full description!
802 * @param c Connection to check.
803 * @returns true if SSL-library has to write protocol data.
806 SSL_WantWrite(const CONNECTION *c)
808 if (Conn_OPTION_ISSET(c, CONN_SSL_WANT_WRITE)) {
809 io_event_add(c->sock, IO_WANTWRITE);
818 SSL_WantRead(UNUSED const CONNECTION *c)
822 SSL_WantWrite(UNUSED const CONNECTION *c)
829 * "Main Loop": Loop until shutdown or restart is signalled.
831 * This function loops until a shutdown or restart of ngIRCd is signalled and
832 * calls io_dispatch() to check for readable and writable sockets every second.
833 * It checks for status changes on pending connections (e. g. when a hostname
834 * has been resolved), checks for "penalties" and timeouts, and handles the
841 unsigned int wdatalen, bytes_processed;
845 while (!NGIRCd_SignalQuit && !NGIRCd_SignalRestart) {
848 /* Check configured servers and established links */
852 /* Expire outdated class/list items */
855 /* Look for non-empty read buffers ... */
856 for (i = 0; i < Pool_Size; i++) {
857 if ((My_Connections[i].sock > NONE)
858 && (array_bytes(&My_Connections[i].rbuf) > 0)
859 && (My_Connections[i].delaytime <= t)) {
860 /* ... and try to handle the received data */
861 bytes_processed = Handle_Buffer(i);
862 /* if we processed data, and there might be
863 * more commands in the input buffer, do not
864 * try to read any more data now */
865 if (bytes_processed &&
866 array_bytes(&My_Connections[i].rbuf) > 2) {
868 ("Throttling connection %d: command limit reached!",
870 Conn_SetPenalty(i, 1);
875 /* Look for non-empty write buffers ... */
876 for (i = 0; i < Pool_Size; i++) {
877 if (My_Connections[i].sock <= NONE)
880 wdatalen = (unsigned int)array_bytes(&My_Connections[i].wbuf);
883 array_bytes(&My_Connections[i].zip.wbuf) > 0)
888 if (SSL_WantRead(&My_Connections[i]))
890 io_event_add(My_Connections[i].sock,
895 /* Check from which sockets we possibly could read ... */
896 for (i = 0; i < Pool_Size; i++) {
897 if (My_Connections[i].sock <= NONE)
900 if (SSL_WantWrite(&My_Connections[i]))
901 continue; /* TLS/SSL layer needs to write data; deal with this first */
903 if (Proc_InProgress(&My_Connections[i].proc_stat)) {
904 /* Wait for completion of forked subprocess
905 * and ignore the socket in the meantime ... */
906 io_event_del(My_Connections[i].sock,
911 if (Conn_OPTION_ISSET(&My_Connections[i], CONN_ISCONNECTING))
912 /* Wait for completion of connect() ... */
915 if (My_Connections[i].delaytime > t) {
916 /* There is a "penalty time" set: ignore socket! */
917 io_event_del(My_Connections[i].sock,
922 io_event_add(My_Connections[i].sock, IO_WANTREAD);
925 /* Set the timeout for reading from the network to 1 second,
926 * which is the granularity with witch we handle "penalty
927 * times" for example.
928 * Note: tv_sec/usec are undefined(!) after io_dispatch()
929 * returns, so we have to set it beforce each call to it! */
933 /* Wait for activity ... */
934 i = io_dispatch(&tv);
935 if (i == -1 && errno != EINTR) {
936 Log(LOG_EMERG, "Conn_Handler(): io_dispatch(): %s!",
938 Log(LOG_ALERT, "%s exiting due to fatal errors!",
943 /* Should ngIRCd timeout when idle? */
944 if (Conf_IdleTimeout > 0 && NumConnectionsAccepted > 0
945 && idle_t > 0 && time(NULL) - idle_t >= Conf_IdleTimeout) {
946 LogDebug("Server idle timeout reached: %d second%s. Initiating shutdown ...",
948 Conf_IdleTimeout == 1 ? "" : "s");
949 NGIRCd_SignalQuit = true;
953 if (NGIRCd_SignalQuit)
954 Log(LOG_NOTICE | LOG_snotice, "Server going down NOW!");
955 else if (NGIRCd_SignalRestart)
956 Log(LOG_NOTICE | LOG_snotice, "Server restarting NOW!");
961 * Write a text string into the socket of a connection.
963 * This function automatically appends CR+LF to the string and validates that
964 * the result is a valid IRC message (oversized messages are shortened, for
965 * example). Then it calls the Conn_Write() function to do the actual sending.
967 * @param Idx Index fo the connection.
968 * @param Format Format string, see printf().
969 * @returns true on success, false otherwise.
973 Conn_WriteStr(CONN_ID Idx, const char *Format, ...)
976 Conn_WriteStr(Idx, Format, va_alist)
982 char buffer[COMMAND_LEN];
990 assert( Idx > NONE );
991 assert( Format != NULL );
994 va_start( ap, Format );
998 if (vsnprintf( buffer, COMMAND_LEN - 2, Format, ap ) >= COMMAND_LEN - 2 ) {
1000 * The string that should be written to the socket is longer
1001 * than the allowed size of COMMAND_LEN bytes (including both
1002 * the CR and LF characters). This can be caused by the
1003 * IRC_WriteXXX() functions when the prefix of this server had
1004 * to be added to an already "quite long" command line which
1005 * has been received from a regular IRC client, for example.
1007 * We are not allowed to send such "oversized" messages to
1008 * other servers and clients, see RFC 2812 2.3 and 2813 3.3
1009 * ("these messages SHALL NOT exceed 512 characters in length,
1010 * counting all characters including the trailing CR-LF").
1012 * So we have a big problem here: we should send more bytes
1013 * to the network than we are allowed to and we don't know
1014 * the originator (any more). The "old" behaviour of blaming
1015 * the receiver ("next hop") is a bad idea (it could be just
1016 * an other server only routing the message!), so the only
1017 * option left is to shorten the string and to hope that the
1018 * result is still somewhat useful ...
1022 strcpy (buffer + sizeof(buffer) - strlen(CUT_TXTSUFFIX) - 2 - 1,
1027 ptr = strchr(buffer + 1, ':');
1030 message = Conn_EncodingTo(Idx, ptr);
1032 strlcpy(ptr, message, sizeof(buffer) - (ptr - buffer));
1038 Log(LOG_DEBUG, " -> connection %d: '%s'.", Idx, buffer);
1041 len = strlcat( buffer, "\r\n", sizeof( buffer ));
1042 ok = Conn_Write(Idx, buffer, len);
1043 My_Connections[Idx].msg_out++;
1047 } /* Conn_WriteStr */
1050 Conn_Password( CONN_ID Idx )
1052 assert( Idx > NONE );
1053 if (My_Connections[Idx].pwd == NULL)
1056 return My_Connections[Idx].pwd;
1057 } /* Conn_Password */
1060 Conn_SetPassword( CONN_ID Idx, const char *Pwd )
1062 assert( Idx > NONE );
1064 if (My_Connections[Idx].pwd)
1065 free(My_Connections[Idx].pwd);
1067 My_Connections[Idx].pwd = strdup(Pwd);
1068 if (My_Connections[Idx].pwd == NULL) {
1069 Log(LOG_EMERG, "Can't allocate memory! [Conn_SetPassword]");
1072 } /* Conn_SetPassword */
1075 * Append Data to the outbound write buffer of a connection.
1077 * @param Idx Index of the connection.
1078 * @param Data pointer to the data.
1079 * @param Len length of Data.
1080 * @returns true on success, false otherwise.
1083 Conn_Write( CONN_ID Idx, char *Data, size_t Len )
1086 size_t writebuf_limit = WRITEBUFFER_MAX_LEN;
1087 assert( Idx > NONE );
1088 assert( Data != NULL );
1091 /* Is the socket still open? A previous call to Conn_Write()
1092 * may have closed the connection due to a fatal error.
1093 * In this case it is sufficient to return an error, as well. */
1094 if (My_Connections[Idx].sock <= NONE) {
1095 LogDebug("Skipped write on closed socket (connection %d).", Idx);
1099 /* Make sure that there still exists a CLIENT structure associated
1100 * with this connection and check if this is a server or not: */
1101 c = Conn_GetClient(Idx);
1103 /* Servers do get special write buffer limits, so they can
1104 * generate all the messages that are required while peering. */
1105 if (Client_Type(c) == CLIENT_SERVER)
1106 writebuf_limit = WRITEBUFFER_SLINK_LEN;
1108 LogDebug("Write on socket without client (connection %d)!?", Idx);
1111 if ( Conn_OPTION_ISSET( &My_Connections[Idx], CONN_ZIP )) {
1113 * Zip_Buffer() does all the dirty work for us: it flushes
1114 * the (pre-)compression buffers if required and handles
1115 * all error conditions. */
1116 if (!Zip_Buffer(Idx, Data, Len))
1122 /* Uncompressed link:
1123 * Check if outbound buffer has enough space for the data. */
1124 if (array_bytes(&My_Connections[Idx].wbuf) + Len >=
1125 WRITEBUFFER_FLUSH_LEN) {
1126 /* Buffer is full, flush it. Handle_Write deals with
1127 * low-level errors, if any. */
1128 if (!Handle_Write(Idx))
1132 /* When the write buffer is still too big after flushing it,
1133 * the connection will be killed. */
1134 if (array_bytes(&My_Connections[Idx].wbuf) + Len >=
1137 "Write buffer space exhausted (connection %d, limit is %lu bytes, %lu bytes new, %lu bytes pending)",
1138 Idx, writebuf_limit, Len,
1139 (unsigned long)array_bytes(&My_Connections[Idx].wbuf));
1140 Conn_Close(Idx, "Write buffer space exhausted", NULL, false);
1144 /* Copy data to write buffer */
1145 if (!array_catb(&My_Connections[Idx].wbuf, Data, Len))
1148 My_Connections[Idx].bytes_out += Len;
1151 /* Adjust global write counter */
1159 * Shut down a connection.
1161 * @param Idx Connection index.
1162 * @param LogMsg Message to write to the log or NULL. If no LogMsg
1163 * is given, the FwdMsg is logged.
1164 * @param FwdMsg Message to forward to remote servers.
1165 * @param InformClient If true, inform the client on the connection which is
1166 * to be shut down of the reason (FwdMsg) and send
1167 * connection statistics before disconnecting it.
1170 Conn_Close( CONN_ID Idx, const char *LogMsg, const char *FwdMsg, bool InformClient )
1172 /* Close connection. Open pipes of asynchronous resolver
1173 * sub-processes are closed down. */
1179 double in_z_k, out_z_k;
1183 assert( Idx > NONE );
1185 /* Is this link already shutting down? */
1186 if( Conn_OPTION_ISSET( &My_Connections[Idx], CONN_ISCLOSING )) {
1187 /* Conn_Close() has been called recursively for this link;
1188 * probabe reason: Handle_Write() failed -- see below. */
1189 LogDebug("Recursive request to close connection: %d", Idx );
1193 assert( My_Connections[Idx].sock > NONE );
1195 /* Mark link as "closing" */
1196 Conn_OPTION_ADD( &My_Connections[Idx], CONN_ISCLOSING );
1198 port = ng_ipaddr_getport(&My_Connections[Idx].addr);
1199 Log(LOG_INFO, "Shutting down connection %d (%s) with \"%s:%d\" ...", Idx,
1200 LogMsg ? LogMsg : FwdMsg, My_Connections[Idx].host, port);
1202 /* Search client, if any */
1203 c = Conn_GetClient( Idx );
1205 /* Should the client be informed? */
1208 /* Send statistics to client if registered as user: */
1209 if ((c != NULL) && (Client_Type(c) == CLIENT_USER)) {
1211 ":%s NOTICE %s :%sConnection statistics: client %.1f kb, server %.1f kb.",
1212 Client_ID(Client_ThisServer()), Client_ID(c),
1214 (double)My_Connections[Idx].bytes_in / 1024,
1215 (double)My_Connections[Idx].bytes_out / 1024);
1218 /* Send ERROR to client (see RFC 2812, section 3.1.7) */
1220 Conn_WriteStr(Idx, "ERROR :%s", FwdMsg);
1222 Conn_WriteStr(Idx, "ERROR :Closing connection");
1225 /* Try to write out the write buffer. Note: Handle_Write() eventually
1226 * removes the CLIENT structure associated with this connection if an
1227 * error occurs! So we have to re-check if there is still an valid
1228 * CLIENT structure after calling Handle_Write() ...*/
1229 (void)Handle_Write( Idx );
1231 /* Search client, if any (re-check!) */
1232 c = Conn_GetClient( Idx );
1234 if ( Conn_OPTION_ISSET( &My_Connections[Idx], CONN_SSL )) {
1235 Log(LOG_INFO, "SSL connection %d shutting down ...", Idx);
1236 ConnSSL_Free(&My_Connections[Idx]);
1239 /* Shut down socket */
1240 if (! io_close(My_Connections[Idx].sock)) {
1241 /* Oops, we can't close the socket!? This is ... ugly! */
1243 "Error closing connection %d (socket %d) with %s:%d - %s! (ignored)",
1244 Idx, My_Connections[Idx].sock, My_Connections[Idx].host,
1245 port, strerror(errno));
1248 /* Mark socket as invalid: */
1249 My_Connections[Idx].sock = NONE;
1251 /* If there is still a client, unregister it now */
1253 Client_Destroy(c, LogMsg, FwdMsg, true);
1255 /* Calculate statistics and log information */
1256 in_k = (double)My_Connections[Idx].bytes_in / 1024;
1257 out_k = (double)My_Connections[Idx].bytes_out / 1024;
1259 if (Conn_OPTION_ISSET( &My_Connections[Idx], CONN_ZIP)) {
1260 in_z_k = (double)My_Connections[Idx].zip.bytes_in / 1024;
1261 out_z_k = (double)My_Connections[Idx].zip.bytes_out / 1024;
1262 /* Make sure that no division by zero can occur during
1263 * the calculation of in_p and out_p: in_z_k and out_z_k
1264 * are non-zero, that's guaranteed by the protocol until
1265 * compression can be enabled. */
1270 in_p = (int)(( in_k * 100 ) / in_z_k );
1271 out_p = (int)(( out_k * 100 ) / out_z_k );
1273 "Connection %d with \"%s:%d\" closed (in: %.1fk/%.1fk/%d%%, out: %.1fk/%.1fk/%d%%).",
1274 Idx, My_Connections[Idx].host, port,
1275 in_k, in_z_k, in_p, out_k, out_z_k, out_p);
1281 "Connection %d with \"%s:%d\" closed (in: %.1fk, out: %.1fk).",
1282 Idx, My_Connections[Idx].host, port,
1286 /* Servers: Modify time of next connect attempt? */
1287 Conf_UnsetServer( Idx );
1290 /* Clean up zlib, if link was compressed */
1291 if ( Conn_OPTION_ISSET( &My_Connections[Idx], CONN_ZIP )) {
1292 inflateEnd( &My_Connections[Idx].zip.in );
1293 deflateEnd( &My_Connections[Idx].zip.out );
1294 array_free(&My_Connections[Idx].zip.rbuf);
1295 array_free(&My_Connections[Idx].zip.wbuf);
1299 array_free(&My_Connections[Idx].rbuf);
1300 array_free(&My_Connections[Idx].wbuf);
1301 if (My_Connections[Idx].pwd != NULL)
1302 free(My_Connections[Idx].pwd);
1304 /* Clean up connection structure (=free it) */
1305 Init_Conn_Struct( Idx );
1307 assert(NumConnections > 0);
1310 LogDebug("Shutdown of connection %d completed, %ld connection%s left.",
1311 Idx, NumConnections, NumConnections != 1 ? "s" : "");
1313 idle_t = NumConnections > 0 ? 0 : time(NULL);
1318 * Get current number of connections.
1320 * @returns Number of current connections.
1325 return NumConnections;
1330 * Get number of maximum simultaneous connections.
1332 * @returns Number of maximum simultaneous connections.
1337 return NumConnectionsMax;
1338 } /* Conn_CountMax */
1342 * Get number of connections accepted since the daemon startet.
1344 * @returns Number of connections accepted.
1347 Conn_CountAccepted(void)
1349 return NumConnectionsAccepted;
1350 } /* Conn_CountAccepted */
1354 * Synchronize established connections and configured server structures
1355 * after a configuration update and store the correct connection IDs, if any.
1358 Conn_SyncServerStruct(void)
1364 for (i = 0; i < Pool_Size; i++) {
1365 if (My_Connections[i].sock == NONE)
1369 client = Conn_GetClient(i);
1370 if (!client || Client_Type(client) != CLIENT_SERVER)
1373 for (c = 0; c < MAX_SERVERS; c++) {
1374 /* Configured server? */
1375 if (!Conf_Server[c].host[0])
1378 if (strcasecmp(Conf_Server[c].name, Client_ID(client)) == 0)
1379 Conf_Server[c].conn_id = i;
1382 } /* SyncServerStruct */
1386 * Get IP address string of a connection.
1388 * @param Idx Connection index.
1389 * @return Pointer to a global buffer containing the IP address as string.
1392 Conn_GetIPAInfo(CONN_ID Idx)
1395 return ng_ipaddr_tostr(&My_Connections[Idx].addr);
1400 * Send out data of write buffer; connect new sockets.
1402 * @param Idx Connection index.
1403 * @returns true on success, false otherwise.
1406 Handle_Write( CONN_ID Idx )
1411 assert( Idx > NONE );
1412 if ( My_Connections[Idx].sock < 0 ) {
1413 LogDebug("Handle_Write() on closed socket, connection %d", Idx);
1416 assert( My_Connections[Idx].sock > NONE );
1418 wdatalen = array_bytes(&My_Connections[Idx].wbuf );
1421 if (wdatalen == 0) {
1422 /* Write buffer is empty, so we try to flush the compression
1423 * buffer and get some data to work with from there :-) */
1424 if (!Zip_Flush(Idx))
1427 /* Now the write buffer most probably has changed: */
1428 wdatalen = array_bytes(&My_Connections[Idx].wbuf);
1432 if (wdatalen == 0) {
1433 /* Still no data, fine. */
1434 io_event_del(My_Connections[Idx].sock, IO_WANTWRITE );
1440 ("Handle_Write() called for connection %d, %ld bytes pending ...",
1445 if ( Conn_OPTION_ISSET( &My_Connections[Idx], CONN_SSL )) {
1446 len = ConnSSL_Write(&My_Connections[Idx], array_start(&My_Connections[Idx].wbuf), wdatalen);
1450 len = write(My_Connections[Idx].sock,
1451 array_start(&My_Connections[Idx].wbuf), wdatalen );
1454 if (errno == EAGAIN || errno == EINTR)
1457 Log(LOG_ERR, "Write error on connection %d (socket %d): %s!",
1458 Idx, My_Connections[Idx].sock, strerror(errno));
1459 Conn_Close(Idx, "Write error!", NULL, false);
1463 /* move any data not yet written to beginning */
1464 array_moveleft(&My_Connections[Idx].wbuf, 1, (size_t)len);
1467 } /* Handle_Write */
1471 * Count established connections to a specific IP address.
1473 * @returns Number of established connections.
1476 Count_Connections(ng_ipaddr_t *a)
1481 for (i = 0; i < Pool_Size; i++) {
1482 if (My_Connections[i].sock <= NONE)
1484 if (ng_ipaddr_ipequal(&My_Connections[i].addr, a))
1488 } /* Count_Connections */
1492 * Initialize new client connection on a listening socket.
1494 * @param Sock Listening socket descriptor.
1495 * @param IsSSL true if this socket expects SSL-encrypted data.
1496 * @returns Accepted socket descriptor or -1 on error.
1499 New_Connection(int Sock, UNUSED bool IsSSL)
1502 struct request_info req;
1504 ng_ipaddr_t new_addr;
1505 char ip_str[NG_INET_ADDRSTRLEN];
1506 int new_sock, new_sock_len;
1510 assert(Sock > NONE);
1512 LogDebug("Accepting new connection on socket %d ...", Sock);
1514 new_sock_len = (int)sizeof(new_addr);
1515 new_sock = accept(Sock, (struct sockaddr *)&new_addr,
1516 (socklen_t *)&new_sock_len);
1518 Log(LOG_CRIT, "Can't accept connection: %s!", strerror(errno));
1521 NumConnectionsAccepted++;
1523 if (!ng_ipaddr_tostr_r(&new_addr, ip_str)) {
1524 Log(LOG_CRIT, "fd %d: Can't convert IP address!", new_sock);
1525 Simple_Message(new_sock, "ERROR :Internal Server Error");
1531 /* Validate socket using TCP Wrappers */
1532 request_init(&req, RQ_DAEMON, PACKAGE_NAME, RQ_FILE, new_sock,
1533 RQ_CLIENT_SIN, &new_addr, NULL);
1535 if (!hosts_access(&req)) {
1537 "Refused connection from %s (by TCP Wrappers)!", ip_str);
1538 Simple_Message(new_sock, "ERROR :Connection refused");
1544 if (!Init_Socket(new_sock))
1547 /* Check global connection limit */
1548 if ((Conf_MaxConnections > 0) &&
1549 (NumConnections >= (size_t) Conf_MaxConnections)) {
1550 Log(LOG_ALERT, "Can't accept connection: limit (%d) reached!",
1551 Conf_MaxConnections);
1552 Simple_Message(new_sock, "ERROR :Connection limit reached");
1557 /* Check IP-based connection limit */
1558 cnt = Count_Connections(&new_addr);
1559 if ((Conf_MaxConnectionsIP > 0) && (cnt >= Conf_MaxConnectionsIP)) {
1560 /* Access denied, too many connections from this IP address! */
1562 "Refused connection from %s: too may connections (%ld) from this IP address!",
1564 Simple_Message(new_sock,
1565 "ERROR :Connection refused, too many connections from your IP address");
1570 if (new_sock >= Pool_Size) {
1571 if (!array_alloc(&My_ConnArray, sizeof(CONNECTION),
1572 (size_t) new_sock)) {
1574 "Can't allocate memory! [New_Connection]");
1575 Simple_Message(new_sock, "ERROR: Internal error");
1579 LogDebug("Bumped connection pool to %ld items (internal: %ld items, %ld bytes)",
1580 new_sock, array_length(&My_ConnArray,
1581 sizeof(CONNECTION)), array_bytes(&My_ConnArray));
1583 /* Adjust pointer to new block */
1584 My_Connections = array_start(&My_ConnArray);
1585 while (Pool_Size <= new_sock)
1586 Init_Conn_Struct(Pool_Size++);
1589 /* register callback */
1590 if (!io_event_create(new_sock, IO_WANTREAD, cb_clientserver)) {
1592 "Can't accept connection: io_event_create failed!");
1593 Simple_Message(new_sock, "ERROR :Internal error");
1598 c = Client_NewLocal(new_sock, NULL, CLIENT_UNKNOWN, false);
1601 "Can't accept connection: can't create client structure!");
1602 Simple_Message(new_sock, "ERROR :Internal error");
1607 Init_Conn_Struct(new_sock);
1608 My_Connections[new_sock].sock = new_sock;
1609 My_Connections[new_sock].addr = new_addr;
1610 My_Connections[new_sock].client = c;
1612 /* Set initial hostname to IP address. This becomes overwritten when
1613 * the DNS lookup is enabled and succeeds, but is used otherwise. */
1614 if (ng_ipaddr_af(&new_addr) != AF_INET)
1615 snprintf(My_Connections[new_sock].host,
1616 sizeof(My_Connections[new_sock].host), "[%s]", ip_str);
1618 strlcpy(My_Connections[new_sock].host, ip_str,
1619 sizeof(My_Connections[new_sock].host));
1621 Client_SetHostname(c, My_Connections[new_sock].host);
1623 Log(LOG_INFO, "Accepted connection %d from \"%s:%d\" on socket %d.",
1624 new_sock, My_Connections[new_sock].host,
1625 ng_ipaddr_getport(&new_addr), Sock);
1626 Account_Connection();
1629 /* Delay connection initalization until SSL handshake is finished */
1632 Conn_StartLogin(new_sock);
1635 } /* New_Connection */
1639 * Finish connection initialization, start resolver subprocess.
1641 * @param Idx Connection index.
1644 Conn_StartLogin(CONN_ID Idx)
1646 int ident_sock = -1;
1650 /* Nothing to do if DNS (and resolver subprocess) is disabled */
1655 /* Should we make an IDENT request? */
1657 ident_sock = My_Connections[Idx].sock;
1660 if (Conf_NoticeAuth) {
1661 /* Send "NOTICE AUTH" messages to the client */
1664 (void)Conn_WriteStr(Idx,
1665 "NOTICE AUTH :*** Looking up your hostname and checking ident");
1668 (void)Conn_WriteStr(Idx,
1669 "NOTICE AUTH :*** Looking up your hostname");
1670 (void)Handle_Write(Idx);
1673 Resolve_Addr(&My_Connections[Idx].proc_stat, &My_Connections[Idx].addr,
1674 ident_sock, cb_Read_Resolver_Result);
1679 * Update global connection counters.
1682 Account_Connection(void)
1686 if (NumConnections > NumConnectionsMax)
1687 NumConnectionsMax = NumConnections;
1688 LogDebug("Total number of connections now %lu (max %lu).",
1689 NumConnections, NumConnectionsMax);
1690 } /* Account_Connection */
1694 * Translate socket handle into connection index.
1696 * @param Sock Socket handle.
1697 * @returns Connecion index or NONE, if no connection could be found.
1700 Socket2Index( int Sock )
1702 assert( Sock >= 0 );
1704 if( Sock >= Pool_Size || My_Connections[Sock].sock != Sock ) {
1705 /* the Connection was already closed again, likely due to
1707 LogDebug("Socket2Index: can't get connection for socket %d!", Sock);
1711 } /* Socket2Index */
1715 * Read data from the network to the read buffer. If an error occures,
1716 * the socket of this connection will be shut down.
1718 * @param Idx Connection index.
1721 Read_Request( CONN_ID Idx )
1724 static const unsigned int maxbps = COMMAND_LEN / 2;
1725 char readbuf[READBUFFER_LEN];
1728 assert( Idx > NONE );
1729 assert( My_Connections[Idx].sock > NONE );
1732 if ((array_bytes(&My_Connections[Idx].rbuf) >= READBUFFER_LEN) ||
1733 (array_bytes(&My_Connections[Idx].zip.rbuf) >= READBUFFER_LEN))
1735 if (array_bytes(&My_Connections[Idx].rbuf) >= READBUFFER_LEN)
1738 /* Read buffer is full */
1740 "Receive buffer space exhausted (connection %d): %d bytes",
1741 Idx, array_bytes(&My_Connections[Idx].rbuf));
1742 Conn_Close(Idx, "Receive buffer space exhausted", NULL, false);
1747 if (Conn_OPTION_ISSET(&My_Connections[Idx], CONN_SSL))
1748 len = ConnSSL_Read( &My_Connections[Idx], readbuf, sizeof(readbuf));
1751 len = read(My_Connections[Idx].sock, readbuf, sizeof(readbuf));
1753 LogDebug("Client \"%s:%u\" is closing connection %d ...",
1754 My_Connections[Idx].host,
1755 ng_ipaddr_tostr(&My_Connections[Idx].addr), Idx);
1756 Conn_Close(Idx, NULL, "Client closed connection", false);
1761 if( errno == EAGAIN ) return;
1762 Log(LOG_ERR, "Read error on connection %d (socket %d): %s!",
1763 Idx, My_Connections[Idx].sock, strerror(errno));
1764 Conn_Close(Idx, "Read error", "Client closed connection",
1769 if (Conn_OPTION_ISSET(&My_Connections[Idx], CONN_ZIP)) {
1770 if (!array_catb(&My_Connections[Idx].zip.rbuf, readbuf,
1773 "Could not append received data to zip input buffer (connection %d): %d bytes!",
1775 Conn_Close(Idx, "Receive buffer space exhausted", NULL,
1782 if (!array_catb( &My_Connections[Idx].rbuf, readbuf, len)) {
1784 "Could not append received data to input buffer (connection %d): %d bytes!",
1786 Conn_Close(Idx, "Receive buffer space exhausted", NULL, false );
1790 /* Update connection statistics */
1791 My_Connections[Idx].bytes_in += len;
1792 My_Connections[Idx].bps += Handle_Buffer(Idx);
1794 /* Make sure that there is still a valid client registered */
1795 c = Conn_GetClient(Idx);
1799 /* Update timestamp of last data received if this connection is
1800 * registered as a user, server or service connection. Don't update
1801 * otherwise, so users have at least Conf_PongTimeout seconds time to
1802 * register with the IRC server -- see Check_Connections().
1803 * Update "lastping", too, if time shifted backwards ... */
1804 if (Client_Type(c) == CLIENT_USER
1805 || Client_Type(c) == CLIENT_SERVER
1806 || Client_Type(c) == CLIENT_SERVICE) {
1808 if (My_Connections[Idx].lastdata != t)
1809 My_Connections[Idx].bps = 0;
1811 My_Connections[Idx].lastdata = t;
1812 if (My_Connections[Idx].lastping > t)
1813 My_Connections[Idx].lastping = t;
1816 /* Look at the data in the (read-) buffer of this connection */
1817 if (Client_Type(c) != CLIENT_SERVER
1818 && Client_Type(c) != CLIENT_UNKNOWNSERVER
1819 && Client_Type(c) != CLIENT_SERVICE
1820 && My_Connections[Idx].bps >= maxbps) {
1821 LogDebug("Throttling connection %d: BPS exceeded! (%u >= %u)",
1822 Idx, My_Connections[Idx].bps, maxbps);
1823 Conn_SetPenalty(Idx, 1);
1825 } /* Read_Request */
1829 * Handle all data in the connection read-buffer.
1831 * Data is processed until no complete command is left in the read buffer,
1832 * or MAX_COMMANDS[_SERVER|_SERVICE] commands were processed.
1833 * When a fatal error occurs, the connection is shut down.
1835 * @param Idx Index of the connection.
1836 * @returns Number of bytes processed.
1839 Handle_Buffer(CONN_ID Idx)
1842 char *ptr1, *ptr2, *first_eol;
1850 unsigned int i, maxcmd = MAX_COMMANDS, len_processed = 0;
1853 c = Conn_GetClient(Idx);
1854 starttime = time(NULL);
1858 /* Servers get special command limits that depend on the user count */
1859 switch (Client_Type(c)) {
1861 maxcmd = (int)(Client_UserCount() / 5)
1862 + MAX_COMMANDS_SERVER_MIN;
1863 /* Allow servers to handle even more commands while peering
1864 * to speed up server login and network synchronisation. */
1865 if (Conn_LastPing(Idx) == 0)
1868 case CLIENT_SERVICE:
1869 maxcmd = MAX_COMMANDS_SERVICE; break;
1872 for (i=0; i < maxcmd; i++) {
1874 if (My_Connections[Idx].delaytime > starttime)
1877 /* Unpack compressed data, if compression is in use */
1878 if (Conn_OPTION_ISSET(&My_Connections[Idx], CONN_ZIP)) {
1879 /* When unzipping fails, Unzip_Buffer() shuts
1880 * down the connection itself */
1881 if (!Unzip_Buffer(Idx))
1886 if (0 == array_bytes(&My_Connections[Idx].rbuf))
1889 /* Make sure that the buffer is NULL terminated */
1890 if (!array_cat0_temporary(&My_Connections[Idx].rbuf)) {
1891 Conn_Close(Idx, NULL,
1892 "Can't allocate memory [Handle_Buffer]",
1897 /* RFC 2812, section "2.3 Messages", 5th paragraph:
1898 * "IRC messages are always lines of characters terminated
1899 * with a CR-LF (Carriage Return - Line Feed) pair [...]". */
1901 ptr = strstr(array_start(&My_Connections[Idx].rbuf), "\r\n");
1904 /* Check for non-RFC-compliant request (only CR or LF)?
1905 * Unfortunately, there are quite a few clients out there
1906 * that do this -- e. g. mIRC, BitchX, and Trillian :-( */
1907 ptr1 = strchr(array_start(&My_Connections[Idx].rbuf), '\r');
1908 ptr2 = strchr(array_start(&My_Connections[Idx].rbuf), '\n');
1910 /* Check if there is a single CR or LF _before_ the
1911 * corerct CR+LF line terminator: */
1912 first_eol = ptr1 < ptr2 ? ptr1 : ptr2;
1913 if (first_eol < ptr) {
1914 /* Single CR or LF before CR+LF found */
1918 } else if (ptr1 || ptr2) {
1919 /* No CR+LF terminated command found, but single
1920 * CR or LF found ... */
1922 ptr = ptr1 < ptr2 ? ptr1 : ptr2;
1924 ptr = ptr1 ? ptr1 : ptr2;
1932 /* Complete (=line terminated) request found, handle it! */
1935 len = ptr - (char *)array_start(&My_Connections[Idx].rbuf) + delta;
1937 if (len > (COMMAND_LEN - 1)) {
1938 /* Request must not exceed 512 chars (incl. CR+LF!),
1939 * see RFC 2812. Disconnect Client if this happens. */
1941 "Request too long (connection %d): %d bytes (max. %d expected)!",
1942 Idx, array_bytes(&My_Connections[Idx].rbuf),
1944 Conn_Close(Idx, NULL, "Request too long", true);
1948 len_processed += (unsigned int)len;
1950 /* Request is empty (only '\r\n', '\r' or '\n');
1951 * delta is 2 ('\r\n') or 1 ('\r' or '\n'), see above */
1952 array_moveleft(&My_Connections[Idx].rbuf, 1, len);
1956 /* remember if stream is already compressed */
1957 old_z = My_Connections[Idx].options & CONN_ZIP;
1960 My_Connections[Idx].msg_in++;
1962 (Idx, (char *)array_start(&My_Connections[Idx].rbuf)))
1963 return 0; /* error -> connection has been closed */
1965 array_moveleft(&My_Connections[Idx].rbuf, 1, len);
1967 LogDebug("Connection %d: %d bytes left in read buffer.",
1968 Idx, array_bytes(&My_Connections[Idx].rbuf));
1971 if ((!old_z) && (My_Connections[Idx].options & CONN_ZIP) &&
1972 (array_bytes(&My_Connections[Idx].rbuf) > 0)) {
1973 /* The last command activated socket compression.
1974 * Data that was read after that needs to be copied
1975 * to the unzip buffer for decompression: */
1977 (&My_Connections[Idx].zip.rbuf,
1978 &My_Connections[Idx].rbuf)) {
1979 Conn_Close(Idx, NULL,
1980 "Can't allocate memory [Handle_Buffer]",
1985 array_trunc(&My_Connections[Idx].rbuf);
1987 ("Moved already received data (%u bytes) to uncompression buffer.",
1988 array_bytes(&My_Connections[Idx].zip.rbuf));
1992 return len_processed;
1993 } /* Handle_Buffer */
1997 * Check whether established connections are still alive or not.
1998 * If not, play PING-PONG first; and if that doesn't help either,
1999 * disconnect the respective peer.
2002 Check_Connections(void)
2008 for (i = 0; i < Pool_Size; i++) {
2009 if (My_Connections[i].sock < 0)
2012 c = Conn_GetClient(i);
2013 if (c && ((Client_Type(c) == CLIENT_USER)
2014 || (Client_Type(c) == CLIENT_SERVER)
2015 || (Client_Type(c) == CLIENT_SERVICE))) {
2016 /* connected User, Server or Service */
2017 if (My_Connections[i].lastping >
2018 My_Connections[i].lastdata) {
2019 /* We already sent a ping */
2020 if (My_Connections[i].lastping <
2021 time(NULL) - Conf_PongTimeout) {
2023 snprintf(msg, sizeof(msg),
2024 "Ping timeout: %d seconds",
2026 LogDebug("Connection %d: %s.", i, msg);
2027 Conn_Close(i, NULL, msg, true);
2029 } else if (My_Connections[i].lastdata <
2030 time(NULL) - Conf_PingTimeout) {
2031 /* We need to send a PING ... */
2032 LogDebug("Connection %d: sending PING ...", i);
2034 Conn_WriteStr(i, "PING :%s",
2035 Client_ID(Client_ThisServer()));
2038 /* The connection is not fully established yet, so
2039 * we don't do the PING-PONG game here but instead
2040 * disconnect the client after "a short time" if it's
2041 * still not registered. */
2043 if (My_Connections[i].lastdata <
2044 time(NULL) - Conf_PongTimeout) {
2046 ("Unregistered connection %d timed out ...",
2048 Conn_Close(i, NULL, "Timeout", false);
2052 } /* Check_Connections */
2056 * Check if further server links should be established.
2064 time_now = time(NULL);
2066 /* Check all configured servers */
2067 for (i = 0; i < MAX_SERVERS; i++) {
2068 if (Conf_Server[i].conn_id != NONE)
2069 continue; /* Already establishing or connected */
2070 if (!Conf_Server[i].host[0] || !Conf_Server[i].port > 0)
2071 continue; /* No host and/or port configured */
2072 if (Conf_Server[i].flags & CONF_SFLAG_DISABLED)
2073 continue; /* Disabled configuration entry */
2074 if (Conf_Server[i].lasttry > (time_now - Conf_ConnectRetry))
2075 continue; /* We have to wait a little bit ... */
2077 /* Is there already a connection in this group? */
2078 if (Conf_Server[i].group > NONE) {
2079 for (n = 0; n < MAX_SERVERS; n++) {
2082 if ((Conf_Server[n].conn_id != NONE) &&
2083 (Conf_Server[n].group == Conf_Server[i].group))
2086 if (n < MAX_SERVERS)
2090 /* Okay, try to connect now */
2092 "Preparing to establish a new server link for \"%s\" ...",
2093 Conf_Server[i].name);
2094 Conf_Server[i].lasttry = time_now;
2095 Conf_Server[i].conn_id = SERVER_WAIT;
2096 assert(Proc_GetPipeFd(&Conf_Server[i].res_stat) < 0);
2097 Resolve_Name(&Conf_Server[i].res_stat, Conf_Server[i].host,
2098 cb_Connect_to_Server);
2100 } /* Check_Servers */
2104 * Establish a new outgoing server connection.
2106 * @param Server Configuration index of the server.
2107 * @param dest Destination IP address to connect to.
2110 New_Server( int Server , ng_ipaddr_t *dest)
2112 /* Establish new server link */
2113 char ip_str[NG_INET_ADDRSTRLEN];
2114 int af_dest, res, new_sock;
2117 assert( Server > NONE );
2119 /* Make sure that the remote server hasn't re-linked to this server
2120 * asynchronously on its own */
2121 if (Conf_Server[Server].conn_id > NONE) {
2123 "Connection to \"%s\" meanwhile re-established, aborting preparation.");
2127 if (!ng_ipaddr_tostr_r(dest, ip_str)) {
2128 Log(LOG_WARNING, "New_Server: Could not convert IP to string");
2132 af_dest = ng_ipaddr_af(dest);
2133 new_sock = socket(af_dest, SOCK_STREAM, 0);
2136 "Establishing connection for \"%s\" to \"%s:%d\" (%s), socket %d ...",
2137 Conf_Server[Server].name, Conf_Server[Server].host,
2138 Conf_Server[Server].port, ip_str, new_sock);
2141 Log(LOG_CRIT, "Can't create socket (af %d): %s!",
2142 af_dest, strerror(errno));
2146 if (!Init_Socket(new_sock))
2149 /* is a bind address configured? */
2150 res = ng_ipaddr_af(&Conf_Server[Server].bind_addr);
2151 /* if yes, bind now. If it fails, warn and let connect() pick a source address */
2152 if (res && bind(new_sock, (struct sockaddr *) &Conf_Server[Server].bind_addr,
2153 ng_ipaddr_salen(&Conf_Server[Server].bind_addr)))
2155 ng_ipaddr_tostr_r(&Conf_Server[Server].bind_addr, ip_str);
2156 Log(LOG_WARNING, "Can't bind socket to %s: %s!", ip_str, strerror(errno));
2158 ng_ipaddr_setport(dest, Conf_Server[Server].port);
2159 res = connect(new_sock, (struct sockaddr *) dest, ng_ipaddr_salen(dest));
2160 if(( res != 0 ) && ( errno != EINPROGRESS )) {
2161 Log( LOG_CRIT, "Can't connect socket: %s!", strerror( errno ));
2166 if (!array_alloc(&My_ConnArray, sizeof(CONNECTION), (size_t)new_sock)) {
2168 "Cannot allocate memory for server connection (socket %d)",
2174 if (!io_event_create( new_sock, IO_WANTWRITE, cb_connserver)) {
2175 Log(LOG_ALERT, "io_event_create(): could not add fd %d", strerror(errno));
2180 My_Connections = array_start(&My_ConnArray);
2182 assert(My_Connections[new_sock].sock <= 0);
2184 Init_Conn_Struct(new_sock);
2186 ng_ipaddr_tostr_r(dest, ip_str);
2187 c = Client_NewLocal(new_sock, ip_str, CLIENT_UNKNOWNSERVER, false);
2189 Log( LOG_ALERT, "Can't establish connection: can't create client structure!" );
2194 /* Conn_Close() decrements this counter again */
2195 Account_Connection();
2196 Client_SetIntroducer( c, c );
2197 Client_SetToken( c, TOKEN_OUTBOUND );
2199 /* Register connection */
2200 if (!Conf_SetServer(Server, new_sock))
2202 My_Connections[new_sock].sock = new_sock;
2203 My_Connections[new_sock].addr = *dest;
2204 My_Connections[new_sock].client = c;
2205 strlcpy( My_Connections[new_sock].host, Conf_Server[Server].host,
2206 sizeof(My_Connections[new_sock].host ));
2209 if (Conf_Server[Server].SSLConnect && !ConnSSL_PrepareConnect( &My_Connections[new_sock],
2210 &Conf_Server[Server] ))
2212 Log(LOG_ALERT, "Could not initialize SSL for outgoing connection");
2213 Conn_Close( new_sock, "Could not initialize SSL for outgoing connection", NULL, false );
2214 Init_Conn_Struct( new_sock );
2215 Conf_Server[Server].conn_id = NONE;
2219 LogDebug("Registered new connection %d on socket %d (%ld in total).",
2220 new_sock, My_Connections[new_sock].sock, NumConnections);
2221 Conn_OPTION_ADD( &My_Connections[new_sock], CONN_ISCONNECTING );
2226 * Initialize connection structure.
2228 * @param Idx Connection index.
2231 Init_Conn_Struct(CONN_ID Idx)
2233 time_t now = time(NULL);
2235 memset(&My_Connections[Idx], 0, sizeof(CONNECTION));
2236 My_Connections[Idx].sock = -1;
2237 My_Connections[Idx].signon = now;
2238 My_Connections[Idx].lastdata = now;
2239 My_Connections[Idx].lastprivmsg = now;
2240 Proc_InitStruct(&My_Connections[Idx].proc_stat);
2243 My_Connections[Idx].iconv_from = (iconv_t)(-1);
2244 My_Connections[Idx].iconv_to = (iconv_t)(-1);
2246 } /* Init_Conn_Struct */
2250 * Initialize options of a new socket.
2252 * For example, we try to set socket options SO_REUSEADDR and IPTOS_LOWDELAY.
2253 * The socket is automatically closed if a fatal error is encountered.
2255 * @param Sock Socket handle.
2256 * @returns false if socket was closed due to fatal error.
2259 Init_Socket( int Sock )
2263 if (!io_setnonblock(Sock)) {
2264 Log( LOG_CRIT, "Can't enable non-blocking mode for socket: %s!", strerror( errno ));
2269 /* Don't block this port after socket shutdown */
2271 if( setsockopt( Sock, SOL_SOCKET, SO_REUSEADDR, &value, (socklen_t)sizeof( value )) != 0 )
2273 Log( LOG_ERR, "Can't set socket option SO_REUSEADDR: %s!", strerror( errno ));
2274 /* ignore this error */
2277 /* Set type of service (TOS) */
2278 #if defined(IPPROTO_IP) && defined(IPTOS_LOWDELAY)
2279 value = IPTOS_LOWDELAY;
2280 if (setsockopt(Sock, IPPROTO_IP, IP_TOS, &value,
2281 (socklen_t) sizeof(value))) {
2282 LogDebug("Can't set socket option IP_TOS: %s!",
2284 /* ignore this error */
2286 LogDebug("IP_TOS on socket %d has been set to IPTOS_LOWDELAY.",
2295 * Read results of a resolver sub-process and try to initiate a new server
2298 * @param fd File descriptor of the pipe to the sub-process.
2299 * @param events (ignored IO specification)
2302 cb_Connect_to_Server(int fd, UNUSED short events)
2304 /* Read result of resolver sub-process from pipe and start connection */
2307 ng_ipaddr_t dest_addrs[4]; /* we can handle at most 3; but we read up to
2308 four so we can log the 'more than we can handle'
2309 condition. First result is tried immediately, rest
2310 is saved for later if needed. */
2312 LogDebug("Resolver: Got forward lookup callback on fd %d, events %d", fd, events);
2314 for (i=0; i < MAX_SERVERS; i++) {
2315 if (Proc_GetPipeFd(&Conf_Server[i].res_stat) == fd )
2319 if( i >= MAX_SERVERS) {
2320 /* Ops, no matching server found?! */
2322 LogDebug("Resolver: Got Forward Lookup callback for unknown server!?");
2326 /* Read result from pipe */
2327 len = Proc_Read(&Conf_Server[i].res_stat, dest_addrs, sizeof(dest_addrs));
2328 Proc_Close(&Conf_Server[i].res_stat);
2330 /* Error resolving hostname: reset server structure */
2331 Conf_Server[i].conn_id = NONE;
2335 assert((len % sizeof(ng_ipaddr_t)) == 0);
2337 LogDebug("Got result from resolver: %u structs (%u bytes).", len/sizeof(ng_ipaddr_t), len);
2339 memset(&Conf_Server[i].dst_addr, 0, sizeof(Conf_Server[i].dst_addr));
2340 if (len > sizeof(ng_ipaddr_t)) {
2341 /* more than one address for this hostname, remember them
2342 * in case first address is unreachable/not available */
2343 len -= sizeof(ng_ipaddr_t);
2344 if (len > sizeof(Conf_Server[i].dst_addr)) {
2345 len = sizeof(Conf_Server[i].dst_addr);
2347 "Notice: Resolver returned more IP Addresses for host than we can handle, additional addresses dropped.");
2349 memcpy(&Conf_Server[i].dst_addr, &dest_addrs[1], len);
2352 New_Server(i, dest_addrs);
2353 } /* cb_Read_Forward_Lookup */
2357 * Read results of a resolver sub-process from the pipe and update the
2358 * apropriate connection/client structure(s): hostname and/or IDENT user name.
2360 * @param r_fd File descriptor of the pipe to the sub-process.
2361 * @param events (ignored IO specification)
2364 cb_Read_Resolver_Result( int r_fd, UNUSED short events )
2371 char readbuf[HOST_LEN + 2 + CLIENT_USER_LEN];
2374 char readbuf[HOST_LEN + 1];
2377 LogDebug("Resolver: Got callback on fd %d, events %d", r_fd, events );
2378 i = Conn_GetFromProc(r_fd);
2380 /* Ops, none found? Probably the connection has already
2381 * been closed!? We'll ignore that ... */
2383 LogDebug("Resolver: Got callback for unknown connection!?");
2387 /* Read result from pipe */
2388 len = Proc_Read(&My_Connections[i].proc_stat, readbuf, sizeof readbuf -1);
2389 Proc_Close(&My_Connections[i].proc_stat);
2393 readbuf[len] = '\0';
2394 identptr = strchr(readbuf, '\n');
2395 assert(identptr != NULL);
2397 Log( LOG_CRIT, "Resolver: Got malformed result!");
2402 LogDebug("Got result from resolver: \"%s\" (%u bytes read).", readbuf, len);
2403 /* Okay, we got a complete result: this is a host name for outgoing
2404 * connections and a host name and IDENT user name (if enabled) for
2405 * incoming connections.*/
2406 assert ( My_Connections[i].sock >= 0 );
2407 /* Incoming connection. Search client ... */
2408 c = Conn_GetClient( i );
2409 assert( c != NULL );
2411 /* Only update client information of unregistered clients.
2412 * Note: user commands (e. g. WEBIRC) are always read _after_ reading
2413 * the resolver results, so we don't have to worry to override settings
2414 * from these commands here. */
2415 if(Client_Type(c) == CLIENT_UNKNOWN) {
2416 strlcpy(My_Connections[i].host, readbuf,
2417 sizeof(My_Connections[i].host));
2418 Client_SetHostname(c, readbuf);
2419 if (Conf_NoticeAuth)
2420 (void)Conn_WriteStr(i,
2421 "NOTICE AUTH :*** Found your hostname: %s",
2422 My_Connections[i].host);
2428 if ((*ptr < '0' || *ptr > '9') &&
2429 (*ptr < 'A' || *ptr > 'Z') &&
2430 (*ptr < 'a' || *ptr > 'z'))
2435 /* Erroneous IDENT reply */
2437 "Got invalid IDENT reply for connection %d! Ignored.",
2441 "IDENT lookup for connection %d: \"%s\".",
2443 Client_SetUser(c, identptr, true);
2445 if (Conf_NoticeAuth) {
2446 (void)Conn_WriteStr(i,
2447 "NOTICE AUTH :*** Got %sident response%s%s",
2448 *ptr ? "invalid " : "",
2450 *ptr ? "" : identptr);
2453 Log(LOG_INFO, "IDENT lookup for connection %d: no result.", i);
2454 if (Conf_NoticeAuth && Conf_Ident)
2455 (void)Conn_WriteStr(i,
2456 "NOTICE AUTH :*** No ident response");
2460 if (Conf_NoticeAuth)
2461 (void)Handle_Write(i);
2463 Class_HandleServerBans(c);
2466 else Log( LOG_DEBUG, "Resolver: discarding result for already registered connection %d.", i );
2468 } /* cb_Read_Resolver_Result */
2472 * Write a "simple" (error) message to a socket.
2474 * The message is sent without using the connection write buffers, without
2475 * compression/encryption, and even without any error reporting. It is
2476 * designed for error messages of e.g. New_Connection().
2478 * @param Sock Socket handle.
2479 * @param Msg Message string to send.
2482 Simple_Message(int Sock, const char *Msg)
2484 char buf[COMMAND_LEN];
2487 assert(Sock > NONE);
2488 assert(Msg != NULL);
2490 strlcpy(buf, Msg, sizeof buf - 2);
2491 len = strlcat(buf, "\r\n", sizeof buf);
2492 if (write(Sock, buf, len) < 0) {
2493 /* Because this function most probably got called to log
2494 * an error message, any write error is ignored here to
2495 * avoid an endless loop. But casting the result of write()
2496 * to "void" doesn't satisfy the GNU C code attribute
2497 * "warn_unused_result" which is used by some versions of
2498 * glibc (e.g. 2.11.1), therefore this silly error
2499 * "handling" code here :-( */
2502 } /* Simple_Error */
2506 * Get CLIENT structure that belongs to a local connection identified by its
2507 * index number. Each connection belongs to a client by definition, so it is
2508 * not required that the caller checks for NULL return values.
2510 * @param Idx Connection index number.
2511 * @returns Pointer to CLIENT structure.
2514 Conn_GetClient( CONN_ID Idx )
2519 c = array_get(&My_ConnArray, sizeof (CONNECTION), (size_t)Idx);
2521 return c ? c->client : NULL;
2525 * Get PROC_STAT sub-process structure of a connection.
2527 * @param Idx Connection index number.
2528 * @returns PROC_STAT structure.
2531 Conn_GetProcStat(CONN_ID Idx)
2536 c = array_get(&My_ConnArray, sizeof (CONNECTION), (size_t)Idx);
2538 return &c->proc_stat;
2539 } /* Conn_GetProcStat */
2543 * Get CONN_ID from file descriptor associated to a subprocess structure.
2545 * @param fd File descriptor.
2546 * @returns CONN_ID or NONE (-1).
2549 Conn_GetFromProc(int fd)
2554 for (i = 0; i < Pool_Size; i++) {
2555 if ((My_Connections[i].sock != NONE)
2556 && (Proc_GetPipeFd(&My_Connections[i].proc_stat) == fd))
2560 } /* Conn_GetFromProc */
2566 Conn_GetAuthPing(CONN_ID Idx)
2568 assert (Idx != NONE);
2569 return My_Connections[Idx].auth_ping;
2570 } /* Conn_GetAuthPing */
2573 Conn_SetAuthPing(CONN_ID Idx, long ID)
2575 assert (Idx != NONE);
2576 My_Connections[Idx].auth_ping = ID;
2577 } /* Conn_SetAuthPing */
2585 * Get information about used SSL chiper.
2587 * @param Idx Connection index number.
2588 * @param buf Buffer for returned information text.
2589 * @param len Size of return buffer "buf".
2590 * @returns true on success, false otherwise.
2593 Conn_GetCipherInfo(CONN_ID Idx, char *buf, size_t len)
2597 assert(Idx < (int) array_length(&My_ConnArray, sizeof(CONNECTION)));
2598 return ConnSSL_GetCipherInfo(&My_Connections[Idx], buf, len);
2603 * Check if a connection is SSL-enabled or not.
2605 * @param Idx Connection index number.
2606 * @return true if connection is SSL-enabled, false otherwise.
2609 Conn_UsesSSL(CONN_ID Idx)
2613 assert(Idx < (int) array_length(&My_ConnArray, sizeof(CONNECTION)));
2614 return Conn_OPTION_ISSET(&My_Connections[Idx], CONN_SSL);
2623 * Dump internal state of the "connection module".
2626 Conn_DebugDump(void)
2630 Log(LOG_DEBUG, "Connection status:");
2631 for (i = 0; i < Pool_Size; i++) {
2632 if (My_Connections[i].sock == NONE)
2635 " - %d: host=%s, lastdata=%ld, lastping=%ld, delaytime=%ld, flag=%d, options=%d, bps=%d, client=%s",
2636 My_Connections[i].sock, My_Connections[i].host,
2637 My_Connections[i].lastdata, My_Connections[i].lastping,
2638 My_Connections[i].delaytime, My_Connections[i].flag,
2639 My_Connections[i].options, My_Connections[i].bps,
2640 My_Connections[i].client ? Client_ID(My_Connections[i].client) : "-");
2642 } /* Conn_DumpClients */