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 new 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, UNUSED 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 */
394 "SSL accept error, closing socket", "SSL accept error",
399 io_event_setcb(sock, cb_clientserver); /* SSL handshake completed */
405 * Initialize connecion module.
412 /* Speicher fuer Verbindungs-Pool anfordern */
413 Pool_Size = CONNECTION_POOL;
414 if ((Conf_MaxConnections > 0) &&
415 (Pool_Size > Conf_MaxConnections))
416 Pool_Size = Conf_MaxConnections;
418 if (!array_alloc(&My_ConnArray, sizeof(CONNECTION), (size_t)Pool_Size)) {
419 Log(LOG_EMERG, "Can't allocate memory! [Conn_Init]");
423 /* FIXME: My_Connetions/Pool_Size is needed by other parts of the
424 * code; remove them! */
425 My_Connections = (CONNECTION*) array_start(&My_ConnArray);
427 LogDebug("Allocated connection pool for %d items (%ld bytes).",
428 array_length(&My_ConnArray, sizeof(CONNECTION)),
429 array_bytes(&My_ConnArray));
431 assert(array_length(&My_ConnArray, sizeof(CONNECTION)) >= (size_t)Pool_Size);
433 array_free( &My_Listeners );
435 for (i = 0; i < Pool_Size; i++)
441 * Clean up connection module.
448 Conn_ExitListeners();
450 LogDebug("Shutting down all connections ..." );
451 for( idx = 0; idx < Pool_Size; idx++ ) {
452 if( My_Connections[idx].sock > NONE ) {
453 Conn_Close( idx, NULL, NGIRCd_SignalRestart ?
454 "Server going down (restarting)":"Server going down", true );
458 array_free(&My_ConnArray);
459 My_Connections = NULL;
461 io_library_shutdown();
466 * Close all sockets (file descriptors) of open connections.
467 * This is useful in forked child processes, for example, to make sure that
468 * they don't hold connections open that the main process wants to close.
471 Conn_CloseAllSockets(int ExceptOf)
475 for(idx = 0; idx < Pool_Size; idx++) {
476 if(My_Connections[idx].sock > NONE &&
477 My_Connections[idx].sock != ExceptOf)
478 close(My_Connections[idx].sock);
484 * Initialize listening ports.
486 * @param a Array containing the ports the daemon should listen on.
487 * @param listen_addr Address the socket should listen on (can be "0.0.0.0").
488 * @param func IO callback function to register.
489 * @returns Number of listening sockets created.
492 Init_Listeners(array *a, const char *listen_addr, void (*func)(int,short))
494 unsigned int created = 0;
499 len = array_length(a, sizeof (UINT16));
500 port = array_start(a);
502 fd = NewListener(listen_addr, *port);
507 if (!io_event_create( fd, IO_WANTREAD, func )) {
509 "io_event_create(): Can't add fd %d (port %u): %s!",
510 fd, (unsigned int) *port, strerror(errno));
523 * Initialize all listening sockets.
525 * @returns Number of created listening sockets
528 Conn_InitListeners( void )
530 /* Initialize ports on which the server should accept connections */
531 unsigned int created = 0;
532 char *af_str, *copy, *listen_addr;
533 int count, fd, i, addr_len;
536 assert(Conf_ListenAddress);
538 count = my_sd_listen_fds();
541 "Not re-initializing listening sockets of systemd(8) ...");
545 /* systemd(8) passed sockets to us, so don't try to initialize
546 * listening sockets on our own but use the passed ones */
547 LogDebug("Initializing %d systemd sockets ...", count);
548 for (i = 0; i < count; i++) {
549 fd = SD_LISTEN_FDS_START + i;
550 addr_len = (int)sizeof(addr);
551 getsockname(fd, (struct sockaddr *)&addr, (socklen_t*)&addr_len);
553 if (addr.sin4.sin_family != AF_INET && addr.sin4.sin_family != AF_INET6)
555 if (addr.sin4.sin_family != AF_INET)
558 /* Socket is of unsupported type! For example, systemd passed in
559 * an IPv6 socket but ngIRCd isn't compiled with IPv6 support. */
560 switch (addr.sin4.sin_family)
562 case AF_UNSPEC: af_str = "AF_UNSPEC"; break;
563 case AF_UNIX: af_str = "AF_UNIX"; break;
564 case AF_INET: af_str = "AF_INET"; break;
566 case AF_INET6: af_str = "AF_INET6"; break;
569 case AF_NETLINK: af_str = "AF_NETLINK"; break;
571 default: af_str = "unknown"; break;
574 "Socket %d is of unsupported type \"%s\" (%d), have to ignore it!",
575 fd, af_str, addr.sin4.sin_family);
581 if (!io_event_create(fd, IO_WANTREAD, cb_listen)) {
583 "io_event_create(): Can't add fd %d: %s!",
584 fd, strerror(errno));
588 "Initialized socket %d from systemd(8): %s:%d.", fd,
589 ng_ipaddr_tostr(&addr), ng_ipaddr_getport(&addr));
595 /* not using systemd socket activation, initialize listening sockets: */
597 /* can't use Conf_ListenAddress directly, see below */
598 copy = strdup(Conf_ListenAddress);
600 Log(LOG_CRIT, "Cannot copy %s: %s", Conf_ListenAddress,
604 listen_addr = strtok(copy, ",");
606 while (listen_addr) {
607 ngt_TrimStr(listen_addr);
609 created += Init_Listeners(&Conf_ListenPorts,
610 listen_addr, cb_listen);
612 created += Init_Listeners(&Conf_SSLOptions.ListenPorts,
613 listen_addr, cb_listen_ssl);
617 listen_addr = strtok(NULL, ",");
620 /* Can't free() Conf_ListenAddress here: on REHASH, if the config file
621 * cannot be re-loaded, we'd end up with a NULL Conf_ListenAddress.
622 * Instead, free() takes place in conf.c, before the config file
623 * is being parsed. */
627 } /* Conn_InitListeners */
631 * Shut down all listening sockets.
634 Conn_ExitListeners( void )
636 /* Close down all listening sockets */
640 /* Get number of listening sockets to shut down. There can be none
641 * if ngIRCd has been "socket activated" by systemd. */
642 arraylen = array_length(&My_Listeners, sizeof (int));
647 "Shutting down all listening sockets (%d total) ...", arraylen);
648 fd = array_start(&My_Listeners);
653 LogDebug("Listening socket %d closed.", *fd );
656 array_free(&My_Listeners);
657 } /* Conn_ExitListeners */
661 * Bind a socket to a specific (source) address.
663 * @param addr Address structure.
664 * @param listen_addrstr Source address as string.
665 * @param Port Port number.
666 * @returns true on success, false otherwise.
669 InitSinaddrListenAddr(ng_ipaddr_t *addr, const char *listen_addrstr, UINT16 Port)
673 ret = ng_ipaddr_init(addr, listen_addrstr, Port);
675 assert(listen_addrstr);
676 Log(LOG_CRIT, "Can't bind to [%s]:%u: can't convert ip address \"%s\"!",
677 listen_addrstr, Port, listen_addrstr);
684 * Set a socket to "IPv6 only". If the given socket doesn't belong to the
685 * AF_INET6 family, or the operating system doesn't support this functionality,
686 * this function retruns silently.
688 * @param af Address family of the socket.
689 * @param sock Socket handle.
692 set_v6_only(int af, int sock)
694 #if defined(IPV6_V6ONLY) && defined(WANT_IPV6)
700 if (setsockopt(sock, IPPROTO_IPV6, IPV6_V6ONLY, &on, (socklen_t)sizeof(on)))
701 Log(LOG_ERR, "Could not set IPV6_V6ONLY: %s", strerror(errno));
710 * Initialize new listening port.
712 * @param listen_addr Local address to bind the socet to (can be 0.0.0.0).
713 * @param Port Port number on which the new socket should be listening.
714 * @returns file descriptor of the socket or -1 on failure.
717 NewListener(const char *listen_addr, UINT16 Port)
719 /* Create new listening socket on specified port */
723 if (!InitSinaddrListenAddr(&addr, listen_addr, Port))
726 af = ng_ipaddr_af(&addr);
727 sock = socket(af, SOCK_STREAM, 0);
729 Log(LOG_CRIT, "Can't create socket (af %d) : %s!", af,
734 set_v6_only(af, sock);
736 if (!Init_Socket(sock))
739 if (bind(sock, (struct sockaddr *)&addr, ng_ipaddr_salen(&addr)) != 0) {
740 Log(LOG_CRIT, "Can't bind socket to address %s:%d - %s!",
741 ng_ipaddr_tostr(&addr), Port, strerror(errno));
746 if (listen(sock, 10) != 0) {
747 Log(LOG_CRIT, "Can't listen on socket: %s!", strerror(errno));
752 /* keep fd in list so we can close it when ngircd restarts/shuts down */
753 if (!array_catb(&My_Listeners, (char *)&sock, sizeof(int))) {
754 Log(LOG_CRIT, "Can't add socket to My_Listeners array: %s!",
760 Log(LOG_INFO, "Now listening on [%s]:%d (socket %d).",
761 ng_ipaddr_tostr(&addr), Port, sock);
769 * Check if SSL library needs to read SSL-protocol related data.
771 * SSL/TLS connections require extra treatment:
772 * When either CONN_SSL_WANT_WRITE or CONN_SSL_WANT_READ is set, we
773 * need to take care of that first, before checking read/write buffers.
774 * For instance, while we might have data in our write buffer, the
775 * TLS/SSL protocol might need to read internal data first for TLS/SSL
778 * If this function returns true, such a condition is met and we have
779 * to reverse the condition (check for read even if we've data to write,
780 * do not check for read but writeability even if write-buffer is empty).
782 * @param c Connection to check.
783 * @returns true if SSL-library has to read protocol data.
786 SSL_WantRead(const CONNECTION *c)
788 if (Conn_OPTION_ISSET(c, CONN_SSL_WANT_READ)) {
789 io_event_add(c->sock, IO_WANTREAD);
796 * Check if SSL library needs to write SSL-protocol related data.
798 * Please see description of SSL_WantRead() for full description!
800 * @param c Connection to check.
801 * @returns true if SSL-library has to write protocol data.
804 SSL_WantWrite(const CONNECTION *c)
806 if (Conn_OPTION_ISSET(c, CONN_SSL_WANT_WRITE)) {
807 io_event_add(c->sock, IO_WANTWRITE);
816 SSL_WantRead(UNUSED const CONNECTION *c)
820 SSL_WantWrite(UNUSED const CONNECTION *c)
827 * "Main Loop": Loop until shutdown or restart is signalled.
829 * This function loops until a shutdown or restart of ngIRCd is signalled and
830 * calls io_dispatch() to check for readable and writable sockets every second.
831 * It checks for status changes on pending connections (e. g. when a hostname
832 * has been resolved), checks for "penalties" and timeouts, and handles the
839 unsigned int wdatalen, bytes_processed;
843 while (!NGIRCd_SignalQuit && !NGIRCd_SignalRestart) {
846 /* Check configured servers and established links */
850 /* Expire outdated class/list items */
853 /* Look for non-empty read buffers ... */
854 for (i = 0; i < Pool_Size; i++) {
855 if ((My_Connections[i].sock > NONE)
856 && (array_bytes(&My_Connections[i].rbuf) > 0)
857 && (My_Connections[i].delaytime <= t)) {
858 /* ... and try to handle the received data */
859 bytes_processed = Handle_Buffer(i);
860 /* if we processed data, and there might be
861 * more commands in the input buffer, do not
862 * try to read any more data now */
863 if (bytes_processed &&
864 array_bytes(&My_Connections[i].rbuf) > 2) {
866 ("Throttling connection %d: command limit reached!",
868 Conn_SetPenalty(i, 1);
873 /* Look for non-empty write buffers ... */
874 for (i = 0; i < Pool_Size; i++) {
875 if (My_Connections[i].sock <= NONE)
878 wdatalen = (unsigned int)array_bytes(&My_Connections[i].wbuf);
881 array_bytes(&My_Connections[i].zip.wbuf) > 0)
886 if (SSL_WantRead(&My_Connections[i]))
888 io_event_add(My_Connections[i].sock,
893 /* Check from which sockets we possibly could read ... */
894 for (i = 0; i < Pool_Size; i++) {
895 if (My_Connections[i].sock <= NONE)
898 if (SSL_WantWrite(&My_Connections[i]))
899 continue; /* TLS/SSL layer needs to write data; deal with this first */
901 if (Proc_InProgress(&My_Connections[i].proc_stat)) {
902 /* Wait for completion of forked subprocess
903 * and ignore the socket in the meantime ... */
904 io_event_del(My_Connections[i].sock,
909 if (Conn_OPTION_ISSET(&My_Connections[i], CONN_ISCONNECTING))
910 /* Wait for completion of connect() ... */
913 if (My_Connections[i].delaytime > t) {
914 /* There is a "penalty time" set: ignore socket! */
915 io_event_del(My_Connections[i].sock,
920 io_event_add(My_Connections[i].sock, IO_WANTREAD);
923 /* Set the timeout for reading from the network to 1 second,
924 * which is the granularity with witch we handle "penalty
925 * times" for example.
926 * Note: tv_sec/usec are undefined(!) after io_dispatch()
927 * returns, so we have to set it beforce each call to it! */
931 /* Wait for activity ... */
932 i = io_dispatch(&tv);
933 if (i == -1 && errno != EINTR) {
934 Log(LOG_EMERG, "Conn_Handler(): io_dispatch(): %s!",
936 Log(LOG_ALERT, "%s exiting due to fatal errors!",
941 /* Should ngIRCd timeout when idle? */
942 if (Conf_IdleTimeout > 0 && NumConnectionsAccepted > 0
943 && idle_t > 0 && time(NULL) - idle_t >= Conf_IdleTimeout) {
944 LogDebug("Server idle timeout reached: %d second%s. Initiating shutdown ...",
946 Conf_IdleTimeout == 1 ? "" : "s");
947 NGIRCd_SignalQuit = true;
951 if (NGIRCd_SignalQuit)
952 Log(LOG_NOTICE | LOG_snotice, "Server going down NOW!");
953 else if (NGIRCd_SignalRestart)
954 Log(LOG_NOTICE | LOG_snotice, "Server restarting NOW!");
959 * Write a text string into the socket of a connection.
961 * This function automatically appends CR+LF to the string and validates that
962 * the result is a valid IRC message (oversized messages are shortened, for
963 * example). Then it calls the Conn_Write() function to do the actual sending.
965 * @param Idx Index fo the connection.
966 * @param Format Format string, see printf().
967 * @returns true on success, false otherwise.
971 Conn_WriteStr(CONN_ID Idx, const char *Format, ...)
974 Conn_WriteStr(Idx, Format, va_alist)
980 char buffer[COMMAND_LEN];
988 assert( Idx > NONE );
989 assert( Format != NULL );
992 va_start( ap, Format );
996 if (vsnprintf( buffer, COMMAND_LEN - 2, Format, ap ) >= COMMAND_LEN - 2 ) {
998 * The string that should be written to the socket is longer
999 * than the allowed size of COMMAND_LEN bytes (including both
1000 * the CR and LF characters). This can be caused by the
1001 * IRC_WriteXXX() functions when the prefix of this server had
1002 * to be added to an already "quite long" command line which
1003 * has been received from a regular IRC client, for example.
1005 * We are not allowed to send such "oversized" messages to
1006 * other servers and clients, see RFC 2812 2.3 and 2813 3.3
1007 * ("these messages SHALL NOT exceed 512 characters in length,
1008 * counting all characters including the trailing CR-LF").
1010 * So we have a big problem here: we should send more bytes
1011 * to the network than we are allowed to and we don't know
1012 * the originator (any more). The "old" behaviour of blaming
1013 * the receiver ("next hop") is a bad idea (it could be just
1014 * an other server only routing the message!), so the only
1015 * option left is to shorten the string and to hope that the
1016 * result is still somewhat useful ...
1020 strcpy (buffer + sizeof(buffer) - strlen(CUT_TXTSUFFIX) - 2 - 1,
1025 ptr = strchr(buffer + 1, ':');
1028 message = Conn_EncodingTo(Idx, ptr);
1030 strlcpy(ptr, message, sizeof(buffer) - (ptr - buffer));
1036 Log(LOG_DEBUG, " -> connection %d: '%s'.", Idx, buffer);
1039 len = strlcat( buffer, "\r\n", sizeof( buffer ));
1040 ok = Conn_Write(Idx, buffer, len);
1041 My_Connections[Idx].msg_out++;
1045 } /* Conn_WriteStr */
1048 Conn_Password( CONN_ID Idx )
1050 assert( Idx > NONE );
1051 if (My_Connections[Idx].pwd == NULL)
1054 return My_Connections[Idx].pwd;
1055 } /* Conn_Password */
1058 Conn_SetPassword( CONN_ID Idx, const char *Pwd )
1060 assert( Idx > NONE );
1062 if (My_Connections[Idx].pwd)
1063 free(My_Connections[Idx].pwd);
1065 My_Connections[Idx].pwd = strdup(Pwd);
1066 if (My_Connections[Idx].pwd == NULL) {
1067 Log(LOG_EMERG, "Can't allocate memory! [Conn_SetPassword]");
1070 } /* Conn_SetPassword */
1073 * Append Data to the outbound write buffer of a connection.
1075 * @param Idx Index of the connection.
1076 * @param Data pointer to the data.
1077 * @param Len length of Data.
1078 * @returns true on success, false otherwise.
1081 Conn_Write( CONN_ID Idx, char *Data, size_t Len )
1084 size_t writebuf_limit = WRITEBUFFER_MAX_LEN;
1085 assert( Idx > NONE );
1086 assert( Data != NULL );
1089 /* Is the socket still open? A previous call to Conn_Write()
1090 * may have closed the connection due to a fatal error.
1091 * In this case it is sufficient to return an error, as well. */
1092 if (My_Connections[Idx].sock <= NONE) {
1093 LogDebug("Skipped write on closed socket (connection %d).", Idx);
1097 /* Make sure that there still exists a CLIENT structure associated
1098 * with this connection and check if this is a server or not: */
1099 c = Conn_GetClient(Idx);
1101 /* Servers do get special write buffer limits, so they can
1102 * generate all the messages that are required while peering. */
1103 if (Client_Type(c) == CLIENT_SERVER)
1104 writebuf_limit = WRITEBUFFER_SLINK_LEN;
1106 LogDebug("Write on socket without client (connection %d)!?", Idx);
1109 if ( Conn_OPTION_ISSET( &My_Connections[Idx], CONN_ZIP )) {
1111 * Zip_Buffer() does all the dirty work for us: it flushes
1112 * the (pre-)compression buffers if required and handles
1113 * all error conditions. */
1114 if (!Zip_Buffer(Idx, Data, Len))
1120 /* Uncompressed link:
1121 * Check if outbound buffer has enough space for the data. */
1122 if (array_bytes(&My_Connections[Idx].wbuf) + Len >=
1123 WRITEBUFFER_FLUSH_LEN) {
1124 /* Buffer is full, flush it. Handle_Write deals with
1125 * low-level errors, if any. */
1126 if (!Handle_Write(Idx))
1130 /* When the write buffer is still too big after flushing it,
1131 * the connection will be killed. */
1132 if (array_bytes(&My_Connections[Idx].wbuf) + Len >=
1135 "Write buffer space exhausted (connection %d, limit is %lu bytes, %lu bytes new, %lu bytes pending)",
1136 Idx, writebuf_limit, Len,
1137 (unsigned long)array_bytes(&My_Connections[Idx].wbuf));
1138 Conn_Close(Idx, "Write buffer space exhausted", NULL, false);
1142 /* Copy data to write buffer */
1143 if (!array_catb(&My_Connections[Idx].wbuf, Data, Len))
1146 My_Connections[Idx].bytes_out += Len;
1149 /* Adjust global write counter */
1157 * Shut down a connection.
1159 * @param Idx Connection index.
1160 * @param LogMsg Message to write to the log or NULL. If no LogMsg
1161 * is given, the FwdMsg is logged.
1162 * @param FwdMsg Message to forward to remote servers.
1163 * @param InformClient If true, inform the client on the connection which is
1164 * to be shut down of the reason (FwdMsg) and send
1165 * connection statistics before disconnecting it.
1168 Conn_Close( CONN_ID Idx, const char *LogMsg, const char *FwdMsg, bool InformClient )
1170 /* Close connection. Open pipes of asynchronous resolver
1171 * sub-processes are closed down. */
1177 double in_z_k, out_z_k;
1181 assert( Idx > NONE );
1183 /* Is this link already shutting down? */
1184 if( Conn_OPTION_ISSET( &My_Connections[Idx], CONN_ISCLOSING )) {
1185 /* Conn_Close() has been called recursively for this link;
1186 * probabe reason: Handle_Write() failed -- see below. */
1187 LogDebug("Recursive request to close connection: %d", Idx );
1191 assert( My_Connections[Idx].sock > NONE );
1193 /* Mark link as "closing" */
1194 Conn_OPTION_ADD( &My_Connections[Idx], CONN_ISCLOSING );
1196 port = ng_ipaddr_getport(&My_Connections[Idx].addr);
1197 Log(LOG_INFO, "Shutting down connection %d (%s) with \"%s:%d\" ...", Idx,
1198 LogMsg ? LogMsg : FwdMsg, My_Connections[Idx].host, port);
1200 /* Search client, if any */
1201 c = Conn_GetClient( Idx );
1203 /* Should the client be informed? */
1206 /* Send statistics to client if registered as user: */
1207 if ((c != NULL) && (Client_Type(c) == CLIENT_USER)) {
1209 ":%s NOTICE %s :%sConnection statistics: client %.1f kb, server %.1f kb.",
1210 Client_ID(Client_ThisServer()), Client_ID(c),
1212 (double)My_Connections[Idx].bytes_in / 1024,
1213 (double)My_Connections[Idx].bytes_out / 1024);
1216 /* Send ERROR to client (see RFC 2812, section 3.1.7) */
1218 Conn_WriteStr(Idx, "ERROR :%s", FwdMsg);
1220 Conn_WriteStr(Idx, "ERROR :Closing connection");
1223 /* Try to write out the write buffer. Note: Handle_Write() eventually
1224 * removes the CLIENT structure associated with this connection if an
1225 * error occurs! So we have to re-check if there is still an valid
1226 * CLIENT structure after calling Handle_Write() ...*/
1227 (void)Handle_Write( Idx );
1229 /* Search client, if any (re-check!) */
1230 c = Conn_GetClient( Idx );
1232 if ( Conn_OPTION_ISSET( &My_Connections[Idx], CONN_SSL )) {
1233 Log(LOG_INFO, "SSL connection %d shutting down ...", Idx);
1234 ConnSSL_Free(&My_Connections[Idx]);
1237 /* Shut down socket */
1238 if (! io_close(My_Connections[Idx].sock)) {
1239 /* Oops, we can't close the socket!? This is ... ugly! */
1241 "Error closing connection %d (socket %d) with %s:%d - %s! (ignored)",
1242 Idx, My_Connections[Idx].sock, My_Connections[Idx].host,
1243 port, strerror(errno));
1246 /* Mark socket as invalid: */
1247 My_Connections[Idx].sock = NONE;
1249 /* If there is still a client, unregister it now */
1251 Client_Destroy(c, LogMsg, FwdMsg, true);
1253 /* Calculate statistics and log information */
1254 in_k = (double)My_Connections[Idx].bytes_in / 1024;
1255 out_k = (double)My_Connections[Idx].bytes_out / 1024;
1257 if (Conn_OPTION_ISSET( &My_Connections[Idx], CONN_ZIP)) {
1258 in_z_k = (double)My_Connections[Idx].zip.bytes_in / 1024;
1259 out_z_k = (double)My_Connections[Idx].zip.bytes_out / 1024;
1260 /* Make sure that no division by zero can occur during
1261 * the calculation of in_p and out_p: in_z_k and out_z_k
1262 * are non-zero, that's guaranteed by the protocol until
1263 * compression can be enabled. */
1268 in_p = (int)(( in_k * 100 ) / in_z_k );
1269 out_p = (int)(( out_k * 100 ) / out_z_k );
1271 "Connection %d with \"%s:%d\" closed (in: %.1fk/%.1fk/%d%%, out: %.1fk/%.1fk/%d%%).",
1272 Idx, My_Connections[Idx].host, port,
1273 in_k, in_z_k, in_p, out_k, out_z_k, out_p);
1279 "Connection %d with \"%s:%d\" closed (in: %.1fk, out: %.1fk).",
1280 Idx, My_Connections[Idx].host, port,
1284 /* Servers: Modify time of next connect attempt? */
1285 Conf_UnsetServer( Idx );
1288 /* Clean up zlib, if link was compressed */
1289 if ( Conn_OPTION_ISSET( &My_Connections[Idx], CONN_ZIP )) {
1290 inflateEnd( &My_Connections[Idx].zip.in );
1291 deflateEnd( &My_Connections[Idx].zip.out );
1292 array_free(&My_Connections[Idx].zip.rbuf);
1293 array_free(&My_Connections[Idx].zip.wbuf);
1297 array_free(&My_Connections[Idx].rbuf);
1298 array_free(&My_Connections[Idx].wbuf);
1299 if (My_Connections[Idx].pwd != NULL)
1300 free(My_Connections[Idx].pwd);
1302 /* Clean up connection structure (=free it) */
1303 Init_Conn_Struct( Idx );
1305 assert(NumConnections > 0);
1308 LogDebug("Shutdown of connection %d completed, %ld connection%s left.",
1309 Idx, NumConnections, NumConnections != 1 ? "s" : "");
1311 idle_t = NumConnections > 0 ? 0 : time(NULL);
1316 * Get current number of connections.
1318 * @returns Number of current connections.
1323 return NumConnections;
1328 * Get number of maximum simultaneous connections.
1330 * @returns Number of maximum simultaneous connections.
1335 return NumConnectionsMax;
1336 } /* Conn_CountMax */
1340 * Get number of connections accepted since the daemon startet.
1342 * @returns Number of connections accepted.
1345 Conn_CountAccepted(void)
1347 return NumConnectionsAccepted;
1348 } /* Conn_CountAccepted */
1352 * Synchronize established connections and configured server structures
1353 * after a configuration update and store the correct connection IDs, if any.
1356 Conn_SyncServerStruct(void)
1362 for (i = 0; i < Pool_Size; i++) {
1363 if (My_Connections[i].sock == NONE)
1367 client = Conn_GetClient(i);
1368 if (!client || Client_Type(client) != CLIENT_SERVER)
1371 for (c = 0; c < MAX_SERVERS; c++) {
1372 /* Configured server? */
1373 if (!Conf_Server[c].host[0])
1376 if (strcasecmp(Conf_Server[c].name, Client_ID(client)) == 0)
1377 Conf_Server[c].conn_id = i;
1380 } /* SyncServerStruct */
1384 * Get IP address string of a connection.
1386 * @param Idx Connection index.
1387 * @return Pointer to a global buffer containing the IP address as string.
1390 Conn_GetIPAInfo(CONN_ID Idx)
1393 return ng_ipaddr_tostr(&My_Connections[Idx].addr);
1398 * Send out data of write buffer; connect new sockets.
1400 * @param Idx Connection index.
1401 * @returns true on success, false otherwise.
1404 Handle_Write( CONN_ID Idx )
1409 assert( Idx > NONE );
1410 if ( My_Connections[Idx].sock < 0 ) {
1411 LogDebug("Handle_Write() on closed socket, connection %d", Idx);
1414 assert( My_Connections[Idx].sock > NONE );
1416 wdatalen = array_bytes(&My_Connections[Idx].wbuf );
1419 if (wdatalen == 0) {
1420 /* Write buffer is empty, so we try to flush the compression
1421 * buffer and get some data to work with from there :-) */
1422 if (!Zip_Flush(Idx))
1425 /* Now the write buffer most probably has changed: */
1426 wdatalen = array_bytes(&My_Connections[Idx].wbuf);
1430 if (wdatalen == 0) {
1431 /* Still no data, fine. */
1432 io_event_del(My_Connections[Idx].sock, IO_WANTWRITE );
1438 ("Handle_Write() called for connection %d, %ld bytes pending ...",
1443 if ( Conn_OPTION_ISSET( &My_Connections[Idx], CONN_SSL )) {
1444 len = ConnSSL_Write(&My_Connections[Idx], array_start(&My_Connections[Idx].wbuf), wdatalen);
1448 len = write(My_Connections[Idx].sock,
1449 array_start(&My_Connections[Idx].wbuf), wdatalen );
1452 if (errno == EAGAIN || errno == EINTR)
1455 Log(LOG_ERR, "Write error on connection %d (socket %d): %s!",
1456 Idx, My_Connections[Idx].sock, strerror(errno));
1457 Conn_Close(Idx, "Write error!", NULL, false);
1461 /* move any data not yet written to beginning */
1462 array_moveleft(&My_Connections[Idx].wbuf, 1, (size_t)len);
1465 } /* Handle_Write */
1469 * Count established connections to a specific IP address.
1471 * @returns Number of established connections.
1474 Count_Connections(ng_ipaddr_t *a)
1479 for (i = 0; i < Pool_Size; i++) {
1480 if (My_Connections[i].sock <= NONE)
1482 if (ng_ipaddr_ipequal(&My_Connections[i].addr, a))
1486 } /* Count_Connections */
1490 * Initialize new client connection on a listening socket.
1492 * @param Sock Listening socket descriptor.
1493 * @param IsSSL true if this socket expects SSL-encrypted data.
1494 * @returns Accepted socket descriptor or -1 on error.
1497 New_Connection(int Sock, UNUSED bool IsSSL)
1500 struct request_info req;
1502 ng_ipaddr_t new_addr;
1503 char ip_str[NG_INET_ADDRSTRLEN];
1504 int new_sock, new_sock_len;
1508 assert(Sock > NONE);
1510 LogDebug("Accepting new connection on socket %d ...", Sock);
1512 new_sock_len = (int)sizeof(new_addr);
1513 new_sock = accept(Sock, (struct sockaddr *)&new_addr,
1514 (socklen_t *)&new_sock_len);
1516 Log(LOG_CRIT, "Can't accept connection: %s!", strerror(errno));
1519 NumConnectionsAccepted++;
1521 if (!ng_ipaddr_tostr_r(&new_addr, ip_str)) {
1522 Log(LOG_CRIT, "fd %d: Can't convert IP address!", new_sock);
1523 Simple_Message(new_sock, "ERROR :Internal Server Error");
1529 /* Validate socket using TCP Wrappers */
1530 request_init(&req, RQ_DAEMON, PACKAGE_NAME, RQ_FILE, new_sock,
1531 RQ_CLIENT_SIN, &new_addr, NULL);
1533 if (!hosts_access(&req)) {
1535 "Refused connection from %s (by TCP Wrappers)!", ip_str);
1536 Simple_Message(new_sock, "ERROR :Connection refused");
1542 if (!Init_Socket(new_sock))
1545 /* Check global connection limit */
1546 if ((Conf_MaxConnections > 0) &&
1547 (NumConnections >= (size_t) Conf_MaxConnections)) {
1548 Log(LOG_ALERT, "Can't accept connection: limit (%d) reached!",
1549 Conf_MaxConnections);
1550 Simple_Message(new_sock, "ERROR :Connection limit reached");
1555 /* Check IP-based connection limit */
1556 cnt = Count_Connections(&new_addr);
1557 if ((Conf_MaxConnectionsIP > 0) && (cnt >= Conf_MaxConnectionsIP)) {
1558 /* Access denied, too many connections from this IP address! */
1560 "Refused connection from %s: too may connections (%ld) from this IP address!",
1562 Simple_Message(new_sock,
1563 "ERROR :Connection refused, too many connections from your IP address");
1568 if (new_sock >= Pool_Size) {
1569 if (!array_alloc(&My_ConnArray, sizeof(CONNECTION),
1570 (size_t) new_sock)) {
1572 "Can't allocate memory! [New_Connection]");
1573 Simple_Message(new_sock, "ERROR: Internal error");
1577 LogDebug("Bumped connection pool to %ld items (internal: %ld items, %ld bytes)",
1578 new_sock, array_length(&My_ConnArray,
1579 sizeof(CONNECTION)), array_bytes(&My_ConnArray));
1581 /* Adjust pointer to new block */
1582 My_Connections = array_start(&My_ConnArray);
1583 while (Pool_Size <= new_sock)
1584 Init_Conn_Struct(Pool_Size++);
1587 /* register callback */
1588 if (!io_event_create(new_sock, IO_WANTREAD, cb_clientserver)) {
1590 "Can't accept connection: io_event_create failed!");
1591 Simple_Message(new_sock, "ERROR :Internal error");
1596 c = Client_NewLocal(new_sock, NULL, CLIENT_UNKNOWN, false);
1599 "Can't accept connection: can't create client structure!");
1600 Simple_Message(new_sock, "ERROR :Internal error");
1605 Init_Conn_Struct(new_sock);
1606 My_Connections[new_sock].sock = new_sock;
1607 My_Connections[new_sock].addr = new_addr;
1608 My_Connections[new_sock].client = c;
1610 /* Set initial hostname to IP address. This becomes overwritten when
1611 * the DNS lookup is enabled and succeeds, but is used otherwise. */
1612 if (ng_ipaddr_af(&new_addr) != AF_INET)
1613 snprintf(My_Connections[new_sock].host,
1614 sizeof(My_Connections[new_sock].host), "[%s]", ip_str);
1616 strlcpy(My_Connections[new_sock].host, ip_str,
1617 sizeof(My_Connections[new_sock].host));
1619 Client_SetHostname(c, My_Connections[new_sock].host);
1621 Log(LOG_INFO, "Accepted connection %d from \"%s:%d\" on socket %d.",
1622 new_sock, My_Connections[new_sock].host,
1623 ng_ipaddr_getport(&new_addr), Sock);
1624 Account_Connection();
1627 /* Delay connection initalization until SSL handshake is finished */
1630 Conn_StartLogin(new_sock);
1633 } /* New_Connection */
1637 * Finish connection initialization, start resolver subprocess.
1639 * @param Idx Connection index.
1642 Conn_StartLogin(CONN_ID Idx)
1644 int ident_sock = -1;
1648 /* Nothing to do if DNS (and resolver subprocess) is disabled */
1653 /* Should we make an IDENT request? */
1655 ident_sock = My_Connections[Idx].sock;
1658 if (Conf_NoticeAuth) {
1659 /* Send "NOTICE AUTH" messages to the client */
1662 (void)Conn_WriteStr(Idx,
1663 "NOTICE AUTH :*** Looking up your hostname and checking ident");
1666 (void)Conn_WriteStr(Idx,
1667 "NOTICE AUTH :*** Looking up your hostname");
1668 (void)Handle_Write(Idx);
1671 Resolve_Addr(&My_Connections[Idx].proc_stat, &My_Connections[Idx].addr,
1672 ident_sock, cb_Read_Resolver_Result);
1677 * Update global connection counters.
1680 Account_Connection(void)
1684 if (NumConnections > NumConnectionsMax)
1685 NumConnectionsMax = NumConnections;
1686 LogDebug("Total number of connections now %lu (max %lu).",
1687 NumConnections, NumConnectionsMax);
1688 } /* Account_Connection */
1692 * Translate socket handle into connection index.
1694 * @param Sock Socket handle.
1695 * @returns Connecion index or NONE, if no connection could be found.
1698 Socket2Index( int Sock )
1700 assert( Sock >= 0 );
1702 if( Sock >= Pool_Size || My_Connections[Sock].sock != Sock ) {
1703 /* the Connection was already closed again, likely due to
1705 LogDebug("Socket2Index: can't get connection for socket %d!", Sock);
1709 } /* Socket2Index */
1713 * Read data from the network to the read buffer. If an error occures,
1714 * the socket of this connection will be shut down.
1716 * @param Idx Connection index.
1719 Read_Request( CONN_ID Idx )
1722 static const unsigned int maxbps = COMMAND_LEN / 2;
1723 char readbuf[READBUFFER_LEN];
1726 assert( Idx > NONE );
1727 assert( My_Connections[Idx].sock > NONE );
1730 if ((array_bytes(&My_Connections[Idx].rbuf) >= READBUFFER_LEN) ||
1731 (array_bytes(&My_Connections[Idx].zip.rbuf) >= READBUFFER_LEN))
1733 if (array_bytes(&My_Connections[Idx].rbuf) >= READBUFFER_LEN)
1736 /* Read buffer is full */
1738 "Receive buffer space exhausted (connection %d): %d bytes",
1739 Idx, array_bytes(&My_Connections[Idx].rbuf));
1740 Conn_Close(Idx, "Receive buffer space exhausted", NULL, false);
1745 if (Conn_OPTION_ISSET(&My_Connections[Idx], CONN_SSL))
1746 len = ConnSSL_Read( &My_Connections[Idx], readbuf, sizeof(readbuf));
1749 len = read(My_Connections[Idx].sock, readbuf, sizeof(readbuf));
1751 LogDebug("Client \"%s:%u\" is closing connection %d ...",
1752 My_Connections[Idx].host,
1753 ng_ipaddr_tostr(&My_Connections[Idx].addr), Idx);
1754 Conn_Close(Idx, NULL, "Client closed connection", false);
1759 if( errno == EAGAIN ) return;
1760 Log(LOG_ERR, "Read error on connection %d (socket %d): %s!",
1761 Idx, My_Connections[Idx].sock, strerror(errno));
1762 Conn_Close(Idx, "Read error", "Client closed connection",
1767 if (Conn_OPTION_ISSET(&My_Connections[Idx], CONN_ZIP)) {
1768 if (!array_catb(&My_Connections[Idx].zip.rbuf, readbuf,
1771 "Could not append received data to zip input buffer (connection %d): %d bytes!",
1773 Conn_Close(Idx, "Receive buffer space exhausted", NULL,
1780 if (!array_catb( &My_Connections[Idx].rbuf, readbuf, len)) {
1782 "Could not append received data to input buffer (connection %d): %d bytes!",
1784 Conn_Close(Idx, "Receive buffer space exhausted", NULL, false );
1788 /* Update connection statistics */
1789 My_Connections[Idx].bytes_in += len;
1790 My_Connections[Idx].bps += Handle_Buffer(Idx);
1792 /* Make sure that there is still a valid client registered */
1793 c = Conn_GetClient(Idx);
1797 /* Update timestamp of last data received if this connection is
1798 * registered as a user, server or service connection. Don't update
1799 * otherwise, so users have at least Conf_PongTimeout seconds time to
1800 * register with the IRC server -- see Check_Connections().
1801 * Update "lastping", too, if time shifted backwards ... */
1802 if (Client_Type(c) == CLIENT_USER
1803 || Client_Type(c) == CLIENT_SERVER
1804 || Client_Type(c) == CLIENT_SERVICE) {
1806 if (My_Connections[Idx].lastdata != t)
1807 My_Connections[Idx].bps = 0;
1809 My_Connections[Idx].lastdata = t;
1810 if (My_Connections[Idx].lastping > t)
1811 My_Connections[Idx].lastping = t;
1814 /* Look at the data in the (read-) buffer of this connection */
1815 if (Client_Type(c) != CLIENT_SERVER
1816 && Client_Type(c) != CLIENT_UNKNOWNSERVER
1817 && Client_Type(c) != CLIENT_SERVICE
1818 && My_Connections[Idx].bps >= maxbps) {
1819 LogDebug("Throttling connection %d: BPS exceeded! (%u >= %u)",
1820 Idx, My_Connections[Idx].bps, maxbps);
1821 Conn_SetPenalty(Idx, 1);
1823 } /* Read_Request */
1827 * Handle all data in the connection read-buffer.
1829 * Data is processed until no complete command is left in the read buffer,
1830 * or MAX_COMMANDS[_SERVER|_SERVICE] commands were processed.
1831 * When a fatal error occurs, the connection is shut down.
1833 * @param Idx Index of the connection.
1834 * @returns Number of bytes processed.
1837 Handle_Buffer(CONN_ID Idx)
1840 char *ptr1, *ptr2, *first_eol;
1848 unsigned int i, maxcmd = MAX_COMMANDS, len_processed = 0;
1851 c = Conn_GetClient(Idx);
1852 starttime = time(NULL);
1856 /* Servers get special command limits that depend on the user count */
1857 switch (Client_Type(c)) {
1859 maxcmd = (int)(Client_UserCount() / 5)
1860 + MAX_COMMANDS_SERVER_MIN;
1861 /* Allow servers to handle even more commands while peering
1862 * to speed up server login and network synchronisation. */
1863 if (Conn_LastPing(Idx) == 0)
1866 case CLIENT_SERVICE:
1867 maxcmd = MAX_COMMANDS_SERVICE; break;
1870 for (i=0; i < maxcmd; i++) {
1872 if (My_Connections[Idx].delaytime > starttime)
1875 /* Unpack compressed data, if compression is in use */
1876 if (Conn_OPTION_ISSET(&My_Connections[Idx], CONN_ZIP)) {
1877 /* When unzipping fails, Unzip_Buffer() shuts
1878 * down the connection itself */
1879 if (!Unzip_Buffer(Idx))
1884 if (0 == array_bytes(&My_Connections[Idx].rbuf))
1887 /* Make sure that the buffer is NULL terminated */
1888 if (!array_cat0_temporary(&My_Connections[Idx].rbuf)) {
1889 Conn_Close(Idx, NULL,
1890 "Can't allocate memory [Handle_Buffer]",
1895 /* RFC 2812, section "2.3 Messages", 5th paragraph:
1896 * "IRC messages are always lines of characters terminated
1897 * with a CR-LF (Carriage Return - Line Feed) pair [...]". */
1899 ptr = strstr(array_start(&My_Connections[Idx].rbuf), "\r\n");
1902 /* Check for non-RFC-compliant request (only CR or LF)?
1903 * Unfortunately, there are quite a few clients out there
1904 * that do this -- e. g. mIRC, BitchX, and Trillian :-( */
1905 ptr1 = strchr(array_start(&My_Connections[Idx].rbuf), '\r');
1906 ptr2 = strchr(array_start(&My_Connections[Idx].rbuf), '\n');
1908 /* Check if there is a single CR or LF _before_ the
1909 * corerct CR+LF line terminator: */
1910 first_eol = ptr1 < ptr2 ? ptr1 : ptr2;
1911 if (first_eol < ptr) {
1912 /* Single CR or LF before CR+LF found */
1916 } else if (ptr1 || ptr2) {
1917 /* No CR+LF terminated command found, but single
1918 * CR or LF found ... */
1920 ptr = ptr1 < ptr2 ? ptr1 : ptr2;
1922 ptr = ptr1 ? ptr1 : ptr2;
1930 /* Complete (=line terminated) request found, handle it! */
1933 len = ptr - (char *)array_start(&My_Connections[Idx].rbuf) + delta;
1935 if (len > (COMMAND_LEN - 1)) {
1936 /* Request must not exceed 512 chars (incl. CR+LF!),
1937 * see RFC 2812. Disconnect Client if this happens. */
1939 "Request too long (connection %d): %d bytes (max. %d expected)!",
1940 Idx, array_bytes(&My_Connections[Idx].rbuf),
1942 Conn_Close(Idx, NULL, "Request too long", true);
1946 len_processed += (unsigned int)len;
1948 /* Request is empty (only '\r\n', '\r' or '\n');
1949 * delta is 2 ('\r\n') or 1 ('\r' or '\n'), see above */
1950 array_moveleft(&My_Connections[Idx].rbuf, 1, len);
1954 /* remember if stream is already compressed */
1955 old_z = My_Connections[Idx].options & CONN_ZIP;
1958 My_Connections[Idx].msg_in++;
1960 (Idx, (char *)array_start(&My_Connections[Idx].rbuf)))
1961 return 0; /* error -> connection has been closed */
1963 array_moveleft(&My_Connections[Idx].rbuf, 1, len);
1965 LogDebug("Connection %d: %d bytes left in read buffer.",
1966 Idx, array_bytes(&My_Connections[Idx].rbuf));
1969 if ((!old_z) && (My_Connections[Idx].options & CONN_ZIP) &&
1970 (array_bytes(&My_Connections[Idx].rbuf) > 0)) {
1971 /* The last command activated socket compression.
1972 * Data that was read after that needs to be copied
1973 * to the unzip buffer for decompression: */
1975 (&My_Connections[Idx].zip.rbuf,
1976 &My_Connections[Idx].rbuf)) {
1977 Conn_Close(Idx, NULL,
1978 "Can't allocate memory [Handle_Buffer]",
1983 array_trunc(&My_Connections[Idx].rbuf);
1985 ("Moved already received data (%u bytes) to uncompression buffer.",
1986 array_bytes(&My_Connections[Idx].zip.rbuf));
1990 return len_processed;
1991 } /* Handle_Buffer */
1995 * Check whether established connections are still alive or not.
1996 * If not, play PING-PONG first; and if that doesn't help either,
1997 * disconnect the respective peer.
2000 Check_Connections(void)
2006 for (i = 0; i < Pool_Size; i++) {
2007 if (My_Connections[i].sock < 0)
2010 c = Conn_GetClient(i);
2011 if (c && ((Client_Type(c) == CLIENT_USER)
2012 || (Client_Type(c) == CLIENT_SERVER)
2013 || (Client_Type(c) == CLIENT_SERVICE))) {
2014 /* connected User, Server or Service */
2015 if (My_Connections[i].lastping >
2016 My_Connections[i].lastdata) {
2017 /* We already sent a ping */
2018 if (My_Connections[i].lastping <
2019 time(NULL) - Conf_PongTimeout) {
2021 snprintf(msg, sizeof(msg),
2022 "Ping timeout: %d seconds",
2024 LogDebug("Connection %d: %s.", i, msg);
2025 Conn_Close(i, NULL, msg, true);
2027 } else if (My_Connections[i].lastdata <
2028 time(NULL) - Conf_PingTimeout) {
2029 /* We need to send a PING ... */
2030 LogDebug("Connection %d: sending PING ...", i);
2032 Conn_WriteStr(i, "PING :%s",
2033 Client_ID(Client_ThisServer()));
2036 /* The connection is not fully established yet, so
2037 * we don't do the PING-PONG game here but instead
2038 * disconnect the client after "a short time" if it's
2039 * still not registered. */
2041 if (My_Connections[i].lastdata <
2042 time(NULL) - Conf_PongTimeout) {
2044 ("Unregistered connection %d timed out ...",
2046 Conn_Close(i, NULL, "Timeout", false);
2050 } /* Check_Connections */
2054 * Check if further server links should be established.
2062 time_now = time(NULL);
2064 /* Check all configured servers */
2065 for (i = 0; i < MAX_SERVERS; i++) {
2066 if (Conf_Server[i].conn_id != NONE)
2067 continue; /* Already establishing or connected */
2068 if (!Conf_Server[i].host[0] || !Conf_Server[i].port > 0)
2069 continue; /* No host and/or port configured */
2070 if (Conf_Server[i].flags & CONF_SFLAG_DISABLED)
2071 continue; /* Disabled configuration entry */
2072 if (Conf_Server[i].lasttry > (time_now - Conf_ConnectRetry))
2073 continue; /* We have to wait a little bit ... */
2075 /* Is there already a connection in this group? */
2076 if (Conf_Server[i].group > NONE) {
2077 for (n = 0; n < MAX_SERVERS; n++) {
2080 if ((Conf_Server[n].conn_id != NONE) &&
2081 (Conf_Server[n].group == Conf_Server[i].group))
2084 if (n < MAX_SERVERS)
2088 /* Okay, try to connect now */
2090 "Preparing to establish a new server link for \"%s\" ...",
2091 Conf_Server[i].name);
2092 Conf_Server[i].lasttry = time_now;
2093 Conf_Server[i].conn_id = SERVER_WAIT;
2094 assert(Proc_GetPipeFd(&Conf_Server[i].res_stat) < 0);
2095 Resolve_Name(&Conf_Server[i].res_stat, Conf_Server[i].host,
2096 cb_Connect_to_Server);
2098 } /* Check_Servers */
2102 * Establish a new outgoing server connection.
2104 * @param Server Configuration index of the server.
2105 * @param dest Destination IP address to connect to.
2108 New_Server( int Server , ng_ipaddr_t *dest)
2110 /* Establish new server link */
2111 char ip_str[NG_INET_ADDRSTRLEN];
2112 int af_dest, res, new_sock;
2115 assert( Server > NONE );
2117 /* Make sure that the remote server hasn't re-linked to this server
2118 * asynchronously on its own */
2119 if (Conf_Server[Server].conn_id > NONE) {
2121 "Connection to \"%s\" meanwhile re-established, aborting preparation.");
2125 if (!ng_ipaddr_tostr_r(dest, ip_str)) {
2126 Log(LOG_WARNING, "New_Server: Could not convert IP to string");
2130 af_dest = ng_ipaddr_af(dest);
2131 new_sock = socket(af_dest, SOCK_STREAM, 0);
2134 "Establishing connection for \"%s\" to \"%s:%d\" (%s), socket %d ...",
2135 Conf_Server[Server].name, Conf_Server[Server].host,
2136 Conf_Server[Server].port, ip_str, new_sock);
2139 Log(LOG_CRIT, "Can't create socket (af %d): %s!",
2140 af_dest, strerror(errno));
2144 if (!Init_Socket(new_sock))
2147 /* is a bind address configured? */
2148 res = ng_ipaddr_af(&Conf_Server[Server].bind_addr);
2149 /* if yes, bind now. If it fails, warn and let connect() pick a source address */
2150 if (res && bind(new_sock, (struct sockaddr *) &Conf_Server[Server].bind_addr,
2151 ng_ipaddr_salen(&Conf_Server[Server].bind_addr)))
2153 ng_ipaddr_tostr_r(&Conf_Server[Server].bind_addr, ip_str);
2154 Log(LOG_WARNING, "Can't bind socket to %s: %s!", ip_str, strerror(errno));
2156 ng_ipaddr_setport(dest, Conf_Server[Server].port);
2157 res = connect(new_sock, (struct sockaddr *) dest, ng_ipaddr_salen(dest));
2158 if(( res != 0 ) && ( errno != EINPROGRESS )) {
2159 Log( LOG_CRIT, "Can't connect socket: %s!", strerror( errno ));
2164 if (!array_alloc(&My_ConnArray, sizeof(CONNECTION), (size_t)new_sock)) {
2166 "Cannot allocate memory for server connection (socket %d)",
2172 if (!io_event_create( new_sock, IO_WANTWRITE, cb_connserver)) {
2173 Log(LOG_ALERT, "io_event_create(): could not add fd %d", strerror(errno));
2178 My_Connections = array_start(&My_ConnArray);
2180 assert(My_Connections[new_sock].sock <= 0);
2182 Init_Conn_Struct(new_sock);
2184 ng_ipaddr_tostr_r(dest, ip_str);
2185 c = Client_NewLocal(new_sock, ip_str, CLIENT_UNKNOWNSERVER, false);
2187 Log( LOG_ALERT, "Can't establish connection: can't create client structure!" );
2192 /* Conn_Close() decrements this counter again */
2193 Account_Connection();
2194 Client_SetIntroducer( c, c );
2195 Client_SetToken( c, TOKEN_OUTBOUND );
2197 /* Register connection */
2198 if (!Conf_SetServer(Server, new_sock))
2200 My_Connections[new_sock].sock = new_sock;
2201 My_Connections[new_sock].addr = *dest;
2202 My_Connections[new_sock].client = c;
2203 strlcpy( My_Connections[new_sock].host, Conf_Server[Server].host,
2204 sizeof(My_Connections[new_sock].host ));
2207 if (Conf_Server[Server].SSLConnect && !ConnSSL_PrepareConnect( &My_Connections[new_sock],
2208 &Conf_Server[Server] ))
2210 Log(LOG_ALERT, "Could not initialize SSL for outgoing connection");
2211 Conn_Close( new_sock, "Could not initialize SSL for outgoing connection", NULL, false );
2212 Init_Conn_Struct( new_sock );
2213 Conf_Server[Server].conn_id = NONE;
2217 LogDebug("Registered new connection %d on socket %d (%ld in total).",
2218 new_sock, My_Connections[new_sock].sock, NumConnections);
2219 Conn_OPTION_ADD( &My_Connections[new_sock], CONN_ISCONNECTING );
2224 * Initialize connection structure.
2226 * @param Idx Connection index.
2229 Init_Conn_Struct(CONN_ID Idx)
2231 time_t now = time(NULL);
2233 memset(&My_Connections[Idx], 0, sizeof(CONNECTION));
2234 My_Connections[Idx].sock = -1;
2235 My_Connections[Idx].signon = now;
2236 My_Connections[Idx].lastdata = now;
2237 My_Connections[Idx].lastprivmsg = now;
2238 Proc_InitStruct(&My_Connections[Idx].proc_stat);
2241 My_Connections[Idx].iconv_from = (iconv_t)(-1);
2242 My_Connections[Idx].iconv_to = (iconv_t)(-1);
2244 } /* Init_Conn_Struct */
2248 * Initialize options of a new socket.
2250 * For example, we try to set socket options SO_REUSEADDR and IPTOS_LOWDELAY.
2251 * The socket is automatically closed if a fatal error is encountered.
2253 * @param Sock Socket handle.
2254 * @returns false if socket was closed due to fatal error.
2257 Init_Socket( int Sock )
2261 if (!io_setnonblock(Sock)) {
2262 Log( LOG_CRIT, "Can't enable non-blocking mode for socket: %s!", strerror( errno ));
2267 /* Don't block this port after socket shutdown */
2269 if( setsockopt( Sock, SOL_SOCKET, SO_REUSEADDR, &value, (socklen_t)sizeof( value )) != 0 )
2271 Log( LOG_ERR, "Can't set socket option SO_REUSEADDR: %s!", strerror( errno ));
2272 /* ignore this error */
2275 /* Set type of service (TOS) */
2276 #if defined(IPPROTO_IP) && defined(IPTOS_LOWDELAY)
2277 value = IPTOS_LOWDELAY;
2278 if (setsockopt(Sock, IPPROTO_IP, IP_TOS, &value,
2279 (socklen_t) sizeof(value))) {
2280 LogDebug("Can't set socket option IP_TOS: %s!",
2282 /* ignore this error */
2284 LogDebug("IP_TOS on socket %d has been set to IPTOS_LOWDELAY.",
2293 * Read results of a resolver sub-process and try to initiate a new server
2296 * @param fd File descriptor of the pipe to the sub-process.
2297 * @param events (ignored IO specification)
2300 cb_Connect_to_Server(int fd, UNUSED short events)
2302 /* Read result of resolver sub-process from pipe and start connection */
2305 ng_ipaddr_t dest_addrs[4]; /* we can handle at most 3; but we read up to
2306 four so we can log the 'more than we can handle'
2307 condition. First result is tried immediately, rest
2308 is saved for later if needed. */
2310 LogDebug("Resolver: Got forward lookup callback on fd %d, events %d", fd, events);
2312 for (i=0; i < MAX_SERVERS; i++) {
2313 if (Proc_GetPipeFd(&Conf_Server[i].res_stat) == fd )
2317 if( i >= MAX_SERVERS) {
2318 /* Ops, no matching server found?! */
2320 LogDebug("Resolver: Got Forward Lookup callback for unknown server!?");
2324 /* Read result from pipe */
2325 len = Proc_Read(&Conf_Server[i].res_stat, dest_addrs, sizeof(dest_addrs));
2326 Proc_Close(&Conf_Server[i].res_stat);
2328 /* Error resolving hostname: reset server structure */
2329 Conf_Server[i].conn_id = NONE;
2333 assert((len % sizeof(ng_ipaddr_t)) == 0);
2335 LogDebug("Got result from resolver: %u structs (%u bytes).", len/sizeof(ng_ipaddr_t), len);
2337 memset(&Conf_Server[i].dst_addr, 0, sizeof(Conf_Server[i].dst_addr));
2338 if (len > sizeof(ng_ipaddr_t)) {
2339 /* more than one address for this hostname, remember them
2340 * in case first address is unreachable/not available */
2341 len -= sizeof(ng_ipaddr_t);
2342 if (len > sizeof(Conf_Server[i].dst_addr)) {
2343 len = sizeof(Conf_Server[i].dst_addr);
2345 "Notice: Resolver returned more IP Addresses for host than we can handle, additional addresses dropped.");
2347 memcpy(&Conf_Server[i].dst_addr, &dest_addrs[1], len);
2350 New_Server(i, dest_addrs);
2351 } /* cb_Read_Forward_Lookup */
2355 * Read results of a resolver sub-process from the pipe and update the
2356 * apropriate connection/client structure(s): hostname and/or IDENT user name.
2358 * @param r_fd File descriptor of the pipe to the sub-process.
2359 * @param events (ignored IO specification)
2362 cb_Read_Resolver_Result( int r_fd, UNUSED short events )
2369 char readbuf[HOST_LEN + 2 + CLIENT_USER_LEN];
2372 char readbuf[HOST_LEN + 1];
2375 LogDebug("Resolver: Got callback on fd %d, events %d", r_fd, events );
2376 i = Conn_GetFromProc(r_fd);
2378 /* Ops, none found? Probably the connection has already
2379 * been closed!? We'll ignore that ... */
2381 LogDebug("Resolver: Got callback for unknown connection!?");
2385 /* Read result from pipe */
2386 len = Proc_Read(&My_Connections[i].proc_stat, readbuf, sizeof readbuf -1);
2387 Proc_Close(&My_Connections[i].proc_stat);
2391 readbuf[len] = '\0';
2392 identptr = strchr(readbuf, '\n');
2393 assert(identptr != NULL);
2395 Log( LOG_CRIT, "Resolver: Got malformed result!");
2400 LogDebug("Got result from resolver: \"%s\" (%u bytes read).", readbuf, len);
2401 /* Okay, we got a complete result: this is a host name for outgoing
2402 * connections and a host name and IDENT user name (if enabled) for
2403 * incoming connections.*/
2404 assert ( My_Connections[i].sock >= 0 );
2405 /* Incoming connection. Search client ... */
2406 c = Conn_GetClient( i );
2407 assert( c != NULL );
2409 /* Only update client information of unregistered clients.
2410 * Note: user commands (e. g. WEBIRC) are always read _after_ reading
2411 * the resolver results, so we don't have to worry to override settings
2412 * from these commands here. */
2413 if(Client_Type(c) == CLIENT_UNKNOWN) {
2414 strlcpy(My_Connections[i].host, readbuf,
2415 sizeof(My_Connections[i].host));
2416 Client_SetHostname(c, readbuf);
2417 if (Conf_NoticeAuth)
2418 (void)Conn_WriteStr(i,
2419 "NOTICE AUTH :*** Found your hostname: %s",
2420 My_Connections[i].host);
2426 if ((*ptr < '0' || *ptr > '9') &&
2427 (*ptr < 'A' || *ptr > 'Z') &&
2428 (*ptr < 'a' || *ptr > 'z'))
2433 /* Erroneous IDENT reply */
2435 "Got invalid IDENT reply for connection %d! Ignored.",
2439 "IDENT lookup for connection %d: \"%s\".",
2441 Client_SetUser(c, identptr, true);
2443 if (Conf_NoticeAuth) {
2444 (void)Conn_WriteStr(i,
2445 "NOTICE AUTH :*** Got %sident response%s%s",
2446 *ptr ? "invalid " : "",
2448 *ptr ? "" : identptr);
2451 Log(LOG_INFO, "IDENT lookup for connection %d: no result.", i);
2452 if (Conf_NoticeAuth && Conf_Ident)
2453 (void)Conn_WriteStr(i,
2454 "NOTICE AUTH :*** No ident response");
2458 if (Conf_NoticeAuth)
2459 (void)Handle_Write(i);
2461 Class_HandleServerBans(c);
2464 else Log( LOG_DEBUG, "Resolver: discarding result for already registered connection %d.", i );
2466 } /* cb_Read_Resolver_Result */
2470 * Write a "simple" (error) message to a socket.
2472 * The message is sent without using the connection write buffers, without
2473 * compression/encryption, and even without any error reporting. It is
2474 * designed for error messages of e.g. New_Connection().
2476 * @param Sock Socket handle.
2477 * @param Msg Message string to send.
2480 Simple_Message(int Sock, const char *Msg)
2482 char buf[COMMAND_LEN];
2485 assert(Sock > NONE);
2486 assert(Msg != NULL);
2488 strlcpy(buf, Msg, sizeof buf - 2);
2489 len = strlcat(buf, "\r\n", sizeof buf);
2490 if (write(Sock, buf, len) < 0) {
2491 /* Because this function most probably got called to log
2492 * an error message, any write error is ignored here to
2493 * avoid an endless loop. But casting the result of write()
2494 * to "void" doesn't satisfy the GNU C code attribute
2495 * "warn_unused_result" which is used by some versions of
2496 * glibc (e.g. 2.11.1), therefore this silly error
2497 * "handling" code here :-( */
2500 } /* Simple_Error */
2504 * Get CLIENT structure that belongs to a local connection identified by its
2505 * index number. Each connection belongs to a client by definition, so it is
2506 * not required that the caller checks for NULL return values.
2508 * @param Idx Connection index number.
2509 * @returns Pointer to CLIENT structure.
2512 Conn_GetClient( CONN_ID Idx )
2517 c = array_get(&My_ConnArray, sizeof (CONNECTION), (size_t)Idx);
2519 return c ? c->client : NULL;
2523 * Get PROC_STAT sub-process structure of a connection.
2525 * @param Idx Connection index number.
2526 * @returns PROC_STAT structure.
2529 Conn_GetProcStat(CONN_ID Idx)
2534 c = array_get(&My_ConnArray, sizeof (CONNECTION), (size_t)Idx);
2536 return &c->proc_stat;
2537 } /* Conn_GetProcStat */
2541 * Get CONN_ID from file descriptor associated to a subprocess structure.
2543 * @param fd File descriptor.
2544 * @returns CONN_ID or NONE (-1).
2547 Conn_GetFromProc(int fd)
2552 for (i = 0; i < Pool_Size; i++) {
2553 if ((My_Connections[i].sock != NONE)
2554 && (Proc_GetPipeFd(&My_Connections[i].proc_stat) == fd))
2558 } /* Conn_GetFromProc */
2564 Conn_GetAuthPing(CONN_ID Idx)
2566 assert (Idx != NONE);
2567 return My_Connections[Idx].auth_ping;
2568 } /* Conn_GetAuthPing */
2571 Conn_SetAuthPing(CONN_ID Idx, long ID)
2573 assert (Idx != NONE);
2574 My_Connections[Idx].auth_ping = ID;
2575 } /* Conn_SetAuthPing */
2583 * Get information about used SSL chiper.
2585 * @param Idx Connection index number.
2586 * @param buf Buffer for returned information text.
2587 * @param len Size of return buffer "buf".
2588 * @returns true on success, false otherwise.
2591 Conn_GetCipherInfo(CONN_ID Idx, char *buf, size_t len)
2595 assert(Idx < (int) array_length(&My_ConnArray, sizeof(CONNECTION)));
2596 return ConnSSL_GetCipherInfo(&My_Connections[Idx], buf, len);
2601 * Check if a connection is SSL-enabled or not.
2603 * @param Idx Connection index number.
2604 * @return true if connection is SSL-enabled, false otherwise.
2607 Conn_UsesSSL(CONN_ID Idx)
2611 assert(Idx < (int) array_length(&My_ConnArray, sizeof(CONNECTION)));
2612 return Conn_OPTION_ISSET(&My_Connections[Idx], CONN_SSL);
2621 * Dump internal state of the "connection module".
2624 Conn_DebugDump(void)
2628 Log(LOG_DEBUG, "Connection status:");
2629 for (i = 0; i < Pool_Size; i++) {
2630 if (My_Connections[i].sock == NONE)
2633 " - %d: host=%s, lastdata=%ld, lastping=%ld, delaytime=%ld, flag=%d, options=%d, bps=%d, client=%s",
2634 My_Connections[i].sock, My_Connections[i].host,
2635 My_Connections[i].lastdata, My_Connections[i].lastping,
2636 My_Connections[i].delaytime, My_Connections[i].flag,
2637 My_Connections[i].options, My_Connections[i].bps,
2638 My_Connections[i].client ? Client_ID(My_Connections[i].client) : "-");
2640 } /* Conn_DumpClients */