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 *copy, *listen_addr;
538 assert(Conf_ListenAddress);
540 count = my_sd_listen_fds();
543 "Not re-initializing listening sockets of systemd(8) ...");
547 /* systemd(8) passed sockets to us, so don't try to initialize
548 * listening sockets on our own but use the passed ones */
549 LogDebug("Initializing %d systemd sockets ...", count);
550 for (i = 0; i < count; i++) {
551 fd = SD_LISTEN_FDS_START + i;
553 if (!io_event_create(fd, IO_WANTREAD, cb_listen)) {
555 "io_event_create(): Can't add fd %d: %s!",
556 fd, strerror(errno));
560 "Initialized socket %d from systemd.", fd);
566 /* not using systemd socket activation, initialize listening sockets: */
568 /* can't use Conf_ListenAddress directly, see below */
569 copy = strdup(Conf_ListenAddress);
571 Log(LOG_CRIT, "Cannot copy %s: %s", Conf_ListenAddress,
575 listen_addr = strtok(copy, ",");
577 while (listen_addr) {
578 ngt_TrimStr(listen_addr);
580 created += Init_Listeners(&Conf_ListenPorts,
581 listen_addr, cb_listen);
583 created += Init_Listeners(&Conf_SSLOptions.ListenPorts,
584 listen_addr, cb_listen_ssl);
588 listen_addr = strtok(NULL, ",");
591 /* Can't free() Conf_ListenAddress here: on REHASH, if the config file
592 * cannot be re-loaded, we'd end up with a NULL Conf_ListenAddress.
593 * Instead, free() takes place in conf.c, before the config file
594 * is being parsed. */
598 } /* Conn_InitListeners */
602 * Shut down all listening sockets.
605 Conn_ExitListeners( void )
607 /* Close down all listening sockets */
611 /* Get number of listening sockets to shut down. There can be none
612 * if ngIRCd has been "socket activated" by systemd. */
613 arraylen = array_length(&My_Listeners, sizeof (int));
618 "Shutting down all listening sockets (%d total) ...", arraylen);
619 fd = array_start(&My_Listeners);
624 LogDebug("Listening socket %d closed.", *fd );
627 array_free(&My_Listeners);
628 } /* Conn_ExitListeners */
632 * Bind a socket to a specific (source) address.
634 * @param addr Address structure.
635 * @param listen_addrstr Source address as string.
636 * @param Port Port number.
637 * @returns true on success, false otherwise.
640 InitSinaddrListenAddr(ng_ipaddr_t *addr, const char *listen_addrstr, UINT16 Port)
644 ret = ng_ipaddr_init(addr, listen_addrstr, Port);
646 assert(listen_addrstr);
647 Log(LOG_CRIT, "Can't bind to [%s]:%u: can't convert ip address \"%s\"!",
648 listen_addrstr, Port, listen_addrstr);
655 * Set a socket to "IPv6 only". If the given socket doesn't belong to the
656 * AF_INET6 family, or the operating system doesn't support this functionality,
657 * this function retruns silently.
659 * @param af Address family of the socket.
660 * @param sock Socket handle.
663 set_v6_only(int af, int sock)
665 #if defined(IPV6_V6ONLY) && defined(WANT_IPV6)
671 if (setsockopt(sock, IPPROTO_IPV6, IPV6_V6ONLY, &on, (socklen_t)sizeof(on)))
672 Log(LOG_ERR, "Could not set IPV6_V6ONLY: %s", strerror(errno));
681 * Initialize new listening port.
683 * @param listen_addr Local address to bind the socet to (can be 0.0.0.0).
684 * @param Port Port number on which the new socket should be listening.
685 * @returns file descriptor of the socket or -1 on failure.
688 NewListener(const char *listen_addr, UINT16 Port)
690 /* Create new listening socket on specified port */
694 if (!InitSinaddrListenAddr(&addr, listen_addr, Port))
697 af = ng_ipaddr_af(&addr);
698 sock = socket(af, SOCK_STREAM, 0);
700 Log(LOG_CRIT, "Can't create socket (af %d) : %s!", af,
705 set_v6_only(af, sock);
707 if (!Init_Socket(sock))
710 if (bind(sock, (struct sockaddr *)&addr, ng_ipaddr_salen(&addr)) != 0) {
711 Log(LOG_CRIT, "Can't bind socket to address %s:%d - %s!",
712 ng_ipaddr_tostr(&addr), Port, strerror(errno));
717 if (listen(sock, 10) != 0) {
718 Log(LOG_CRIT, "Can't listen on socket: %s!", strerror(errno));
723 /* keep fd in list so we can close it when ngircd restarts/shuts down */
724 if (!array_catb(&My_Listeners, (char *)&sock, sizeof(int))) {
725 Log(LOG_CRIT, "Can't add socket to My_Listeners array: %s!",
731 Log(LOG_INFO, "Now listening on [%s]:%d (socket %d).",
732 ng_ipaddr_tostr(&addr), Port, sock);
740 * Check if SSL library needs to read SSL-protocol related data.
742 * SSL/TLS connections require extra treatment:
743 * When either CONN_SSL_WANT_WRITE or CONN_SSL_WANT_READ is set, we
744 * need to take care of that first, before checking read/write buffers.
745 * For instance, while we might have data in our write buffer, the
746 * TLS/SSL protocol might need to read internal data first for TLS/SSL
749 * If this function returns true, such a condition is met and we have
750 * to reverse the condition (check for read even if we've data to write,
751 * do not check for read but writeability even if write-buffer is empty).
753 * @param c Connection to check.
754 * @returns true if SSL-library has to read protocol data.
757 SSL_WantRead(const CONNECTION *c)
759 if (Conn_OPTION_ISSET(c, CONN_SSL_WANT_READ)) {
760 io_event_add(c->sock, IO_WANTREAD);
767 * Check if SSL library needs to write SSL-protocol related data.
769 * Please see description of SSL_WantRead() for full description!
771 * @param c Connection to check.
772 * @returns true if SSL-library has to write protocol data.
775 SSL_WantWrite(const CONNECTION *c)
777 if (Conn_OPTION_ISSET(c, CONN_SSL_WANT_WRITE)) {
778 io_event_add(c->sock, IO_WANTWRITE);
787 SSL_WantRead(UNUSED const CONNECTION *c)
791 SSL_WantWrite(UNUSED const CONNECTION *c)
798 * "Main Loop": Loop until shutdown or restart is signalled.
800 * This function loops until a shutdown or restart of ngIRCd is signalled and
801 * calls io_dispatch() to check for readable and writable sockets every second.
802 * It checks for status changes on pending connections (e. g. when a hostname
803 * has been resolved), checks for "penalties" and timeouts, and handles the
810 unsigned int wdatalen, bytes_processed;
814 while (!NGIRCd_SignalQuit && !NGIRCd_SignalRestart) {
817 /* Check configured servers and established links */
821 /* Expire outdated class/list items */
824 /* Look for non-empty read buffers ... */
825 for (i = 0; i < Pool_Size; i++) {
826 if ((My_Connections[i].sock > NONE)
827 && (array_bytes(&My_Connections[i].rbuf) > 0)
828 && (My_Connections[i].delaytime <= t)) {
829 /* ... and try to handle the received data */
830 bytes_processed = Handle_Buffer(i);
831 /* if we processed data, and there might be
832 * more commands in the input buffer, do not
833 * try to read any more data now */
834 if (bytes_processed &&
835 array_bytes(&My_Connections[i].rbuf) > 2) {
837 ("Throttling connection %d: command limit reached!",
839 Conn_SetPenalty(i, 1);
844 /* Look for non-empty write buffers ... */
845 for (i = 0; i < Pool_Size; i++) {
846 if (My_Connections[i].sock <= NONE)
849 wdatalen = (unsigned int)array_bytes(&My_Connections[i].wbuf);
852 array_bytes(&My_Connections[i].zip.wbuf) > 0)
857 if (SSL_WantRead(&My_Connections[i]))
859 io_event_add(My_Connections[i].sock,
864 /* Check from which sockets we possibly could read ... */
865 for (i = 0; i < Pool_Size; i++) {
866 if (My_Connections[i].sock <= NONE)
869 if (SSL_WantWrite(&My_Connections[i]))
870 continue; /* TLS/SSL layer needs to write data; deal with this first */
872 if (Proc_InProgress(&My_Connections[i].proc_stat)) {
873 /* Wait for completion of forked subprocess
874 * and ignore the socket in the meantime ... */
875 io_event_del(My_Connections[i].sock,
880 if (Conn_OPTION_ISSET(&My_Connections[i], CONN_ISCONNECTING))
881 /* Wait for completion of connect() ... */
884 if (My_Connections[i].delaytime > t) {
885 /* There is a "penalty time" set: ignore socket! */
886 io_event_del(My_Connections[i].sock,
891 io_event_add(My_Connections[i].sock, IO_WANTREAD);
894 /* Set the timeout for reading from the network to 1 second,
895 * which is the granularity with witch we handle "penalty
896 * times" for example.
897 * Note: tv_sec/usec are undefined(!) after io_dispatch()
898 * returns, so we have to set it beforce each call to it! */
902 /* Wait for activity ... */
903 i = io_dispatch(&tv);
904 if (i == -1 && errno != EINTR) {
905 Log(LOG_EMERG, "Conn_Handler(): io_dispatch(): %s!",
907 Log(LOG_ALERT, "%s exiting due to fatal errors!",
912 /* Should ngIRCd timeout when idle? */
913 if (Conf_IdleTimeout > 0 && NumConnectionsAccepted > 0
914 && idle_t > 0 && time(NULL) - idle_t >= Conf_IdleTimeout) {
915 LogDebug("Server idle timeout reached: %d second%s. Initiating shutdown ...",
917 Conf_IdleTimeout == 1 ? "" : "s");
918 NGIRCd_SignalQuit = true;
922 if (NGIRCd_SignalQuit)
923 Log(LOG_NOTICE | LOG_snotice, "Server going down NOW!");
924 else if (NGIRCd_SignalRestart)
925 Log(LOG_NOTICE | LOG_snotice, "Server restarting NOW!");
930 * Write a text string into the socket of a connection.
932 * This function automatically appends CR+LF to the string and validates that
933 * the result is a valid IRC message (oversized messages are shortened, for
934 * example). Then it calls the Conn_Write() function to do the actual sending.
936 * @param Idx Index fo the connection.
937 * @param Format Format string, see printf().
938 * @returns true on success, false otherwise.
942 Conn_WriteStr(CONN_ID Idx, const char *Format, ...)
945 Conn_WriteStr(Idx, Format, va_alist)
951 char buffer[COMMAND_LEN];
959 assert( Idx > NONE );
960 assert( Format != NULL );
963 va_start( ap, Format );
967 if (vsnprintf( buffer, COMMAND_LEN - 2, Format, ap ) >= COMMAND_LEN - 2 ) {
969 * The string that should be written to the socket is longer
970 * than the allowed size of COMMAND_LEN bytes (including both
971 * the CR and LF characters). This can be caused by the
972 * IRC_WriteXXX() functions when the prefix of this server had
973 * to be added to an already "quite long" command line which
974 * has been received from a regular IRC client, for example.
976 * We are not allowed to send such "oversized" messages to
977 * other servers and clients, see RFC 2812 2.3 and 2813 3.3
978 * ("these messages SHALL NOT exceed 512 characters in length,
979 * counting all characters including the trailing CR-LF").
981 * So we have a big problem here: we should send more bytes
982 * to the network than we are allowed to and we don't know
983 * the originator (any more). The "old" behaviour of blaming
984 * the receiver ("next hop") is a bad idea (it could be just
985 * an other server only routing the message!), so the only
986 * option left is to shorten the string and to hope that the
987 * result is still somewhat useful ...
991 strcpy (buffer + sizeof(buffer) - strlen(CUT_TXTSUFFIX) - 2 - 1,
996 ptr = strchr(buffer + 1, ':');
999 message = Conn_EncodingTo(Idx, ptr);
1001 strlcpy(ptr, message, sizeof(buffer) - (ptr - buffer));
1007 Log(LOG_DEBUG, " -> connection %d: '%s'.", Idx, buffer);
1010 len = strlcat( buffer, "\r\n", sizeof( buffer ));
1011 ok = Conn_Write(Idx, buffer, len);
1012 My_Connections[Idx].msg_out++;
1016 } /* Conn_WriteStr */
1019 Conn_Password( CONN_ID Idx )
1021 assert( Idx > NONE );
1022 if (My_Connections[Idx].pwd == NULL)
1025 return My_Connections[Idx].pwd;
1026 } /* Conn_Password */
1029 Conn_SetPassword( CONN_ID Idx, const char *Pwd )
1031 assert( Idx > NONE );
1033 if (My_Connections[Idx].pwd)
1034 free(My_Connections[Idx].pwd);
1036 My_Connections[Idx].pwd = strdup(Pwd);
1037 if (My_Connections[Idx].pwd == NULL) {
1038 Log(LOG_EMERG, "Can't allocate memory! [Conn_SetPassword]");
1041 } /* Conn_SetPassword */
1044 * Append Data to the outbound write buffer of a connection.
1046 * @param Idx Index of the connection.
1047 * @param Data pointer to the data.
1048 * @param Len length of Data.
1049 * @returns true on success, false otherwise.
1052 Conn_Write( CONN_ID Idx, char *Data, size_t Len )
1055 size_t writebuf_limit = WRITEBUFFER_MAX_LEN;
1056 assert( Idx > NONE );
1057 assert( Data != NULL );
1060 /* Is the socket still open? A previous call to Conn_Write()
1061 * may have closed the connection due to a fatal error.
1062 * In this case it is sufficient to return an error, as well. */
1063 if (My_Connections[Idx].sock <= NONE) {
1064 LogDebug("Skipped write on closed socket (connection %d).", Idx);
1068 /* Make sure that there still exists a CLIENT structure associated
1069 * with this connection and check if this is a server or not: */
1070 c = Conn_GetClient(Idx);
1072 /* Servers do get special write buffer limits, so they can
1073 * generate all the messages that are required while peering. */
1074 if (Client_Type(c) == CLIENT_SERVER)
1075 writebuf_limit = WRITEBUFFER_SLINK_LEN;
1077 LogDebug("Write on socket without client (connection %d)!?", Idx);
1080 if ( Conn_OPTION_ISSET( &My_Connections[Idx], CONN_ZIP )) {
1082 * Zip_Buffer() does all the dirty work for us: it flushes
1083 * the (pre-)compression buffers if required and handles
1084 * all error conditions. */
1085 if (!Zip_Buffer(Idx, Data, Len))
1091 /* Uncompressed link:
1092 * Check if outbound buffer has enough space for the data. */
1093 if (array_bytes(&My_Connections[Idx].wbuf) + Len >=
1094 WRITEBUFFER_FLUSH_LEN) {
1095 /* Buffer is full, flush it. Handle_Write deals with
1096 * low-level errors, if any. */
1097 if (!Handle_Write(Idx))
1101 /* When the write buffer is still too big after flushing it,
1102 * the connection will be killed. */
1103 if (array_bytes(&My_Connections[Idx].wbuf) + Len >=
1106 "Write buffer space exhausted (connection %d, limit is %lu bytes, %lu bytes new, %lu bytes pending)",
1107 Idx, writebuf_limit, Len,
1108 (unsigned long)array_bytes(&My_Connections[Idx].wbuf));
1109 Conn_Close(Idx, "Write buffer space exhausted", NULL, false);
1113 /* Copy data to write buffer */
1114 if (!array_catb(&My_Connections[Idx].wbuf, Data, Len))
1117 My_Connections[Idx].bytes_out += Len;
1120 /* Adjust global write counter */
1128 * Shut down a connection.
1130 * @param Idx Connection index.
1131 * @param LogMsg Message to write to the log or NULL. If no LogMsg
1132 * is given, the FwdMsg is logged.
1133 * @param FwdMsg Message to forward to remote servers.
1134 * @param InformClient If true, inform the client on the connection which is
1135 * to be shut down of the reason (FwdMsg) and send
1136 * connection statistics before disconnecting it.
1139 Conn_Close( CONN_ID Idx, const char *LogMsg, const char *FwdMsg, bool InformClient )
1141 /* Close connection. Open pipes of asynchronous resolver
1142 * sub-processes are closed down. */
1148 double in_z_k, out_z_k;
1152 assert( Idx > NONE );
1154 /* Is this link already shutting down? */
1155 if( Conn_OPTION_ISSET( &My_Connections[Idx], CONN_ISCLOSING )) {
1156 /* Conn_Close() has been called recursively for this link;
1157 * probabe reason: Handle_Write() failed -- see below. */
1158 LogDebug("Recursive request to close connection: %d", Idx );
1162 assert( My_Connections[Idx].sock > NONE );
1164 /* Mark link as "closing" */
1165 Conn_OPTION_ADD( &My_Connections[Idx], CONN_ISCLOSING );
1167 port = ng_ipaddr_getport(&My_Connections[Idx].addr);
1168 Log(LOG_INFO, "Shutting down connection %d (%s) with \"%s:%d\" ...", Idx,
1169 LogMsg ? LogMsg : FwdMsg, My_Connections[Idx].host, port);
1171 /* Search client, if any */
1172 c = Conn_GetClient( Idx );
1174 /* Should the client be informed? */
1177 /* Send statistics to client if registered as user: */
1178 if ((c != NULL) && (Client_Type(c) == CLIENT_USER)) {
1180 ":%s NOTICE %s :%sConnection statistics: client %.1f kb, server %.1f kb.",
1181 Client_ID(Client_ThisServer()), Client_ID(c),
1183 (double)My_Connections[Idx].bytes_in / 1024,
1184 (double)My_Connections[Idx].bytes_out / 1024);
1187 /* Send ERROR to client (see RFC 2812, section 3.1.7) */
1189 Conn_WriteStr(Idx, "ERROR :%s", FwdMsg);
1191 Conn_WriteStr(Idx, "ERROR :Closing connection");
1194 /* Try to write out the write buffer. Note: Handle_Write() eventually
1195 * removes the CLIENT structure associated with this connection if an
1196 * error occurs! So we have to re-check if there is still an valid
1197 * CLIENT structure after calling Handle_Write() ...*/
1198 (void)Handle_Write( Idx );
1200 /* Search client, if any (re-check!) */
1201 c = Conn_GetClient( Idx );
1203 if ( Conn_OPTION_ISSET( &My_Connections[Idx], CONN_SSL )) {
1204 Log(LOG_INFO, "SSL connection %d shutting down ...", Idx);
1205 ConnSSL_Free(&My_Connections[Idx]);
1208 /* Shut down socket */
1209 if (! io_close(My_Connections[Idx].sock)) {
1210 /* Oops, we can't close the socket!? This is ... ugly! */
1212 "Error closing connection %d (socket %d) with %s:%d - %s! (ignored)",
1213 Idx, My_Connections[Idx].sock, My_Connections[Idx].host,
1214 port, strerror(errno));
1217 /* Mark socket as invalid: */
1218 My_Connections[Idx].sock = NONE;
1220 /* If there is still a client, unregister it now */
1222 Client_Destroy(c, LogMsg, FwdMsg, true);
1224 /* Calculate statistics and log information */
1225 in_k = (double)My_Connections[Idx].bytes_in / 1024;
1226 out_k = (double)My_Connections[Idx].bytes_out / 1024;
1228 if (Conn_OPTION_ISSET( &My_Connections[Idx], CONN_ZIP)) {
1229 in_z_k = (double)My_Connections[Idx].zip.bytes_in / 1024;
1230 out_z_k = (double)My_Connections[Idx].zip.bytes_out / 1024;
1231 /* Make sure that no division by zero can occur during
1232 * the calculation of in_p and out_p: in_z_k and out_z_k
1233 * are non-zero, that's guaranteed by the protocol until
1234 * compression can be enabled. */
1239 in_p = (int)(( in_k * 100 ) / in_z_k );
1240 out_p = (int)(( out_k * 100 ) / out_z_k );
1242 "Connection %d with \"%s:%d\" closed (in: %.1fk/%.1fk/%d%%, out: %.1fk/%.1fk/%d%%).",
1243 Idx, My_Connections[Idx].host, port,
1244 in_k, in_z_k, in_p, out_k, out_z_k, out_p);
1250 "Connection %d with \"%s:%d\" closed (in: %.1fk, out: %.1fk).",
1251 Idx, My_Connections[Idx].host, port,
1255 /* Servers: Modify time of next connect attempt? */
1256 Conf_UnsetServer( Idx );
1259 /* Clean up zlib, if link was compressed */
1260 if ( Conn_OPTION_ISSET( &My_Connections[Idx], CONN_ZIP )) {
1261 inflateEnd( &My_Connections[Idx].zip.in );
1262 deflateEnd( &My_Connections[Idx].zip.out );
1263 array_free(&My_Connections[Idx].zip.rbuf);
1264 array_free(&My_Connections[Idx].zip.wbuf);
1268 array_free(&My_Connections[Idx].rbuf);
1269 array_free(&My_Connections[Idx].wbuf);
1270 if (My_Connections[Idx].pwd != NULL)
1271 free(My_Connections[Idx].pwd);
1273 /* Clean up connection structure (=free it) */
1274 Init_Conn_Struct( Idx );
1276 assert(NumConnections > 0);
1279 LogDebug("Shutdown of connection %d completed, %ld connection%s left.",
1280 Idx, NumConnections, NumConnections != 1 ? "s" : "");
1282 idle_t = NumConnections > 0 ? 0 : time(NULL);
1287 * Get current number of connections.
1289 * @returns Number of current connections.
1294 return NumConnections;
1299 * Get number of maximum simultaneous connections.
1301 * @returns Number of maximum simultaneous connections.
1306 return NumConnectionsMax;
1307 } /* Conn_CountMax */
1311 * Get number of connections accepted since the daemon startet.
1313 * @returns Number of connections accepted.
1316 Conn_CountAccepted(void)
1318 return NumConnectionsAccepted;
1319 } /* Conn_CountAccepted */
1323 * Synchronize established connections and configured server structures
1324 * after a configuration update and store the correct connection IDs, if any.
1327 Conn_SyncServerStruct(void)
1333 for (i = 0; i < Pool_Size; i++) {
1334 if (My_Connections[i].sock == NONE)
1338 client = Conn_GetClient(i);
1339 if (!client || Client_Type(client) != CLIENT_SERVER)
1342 for (c = 0; c < MAX_SERVERS; c++) {
1343 /* Configured server? */
1344 if (!Conf_Server[c].host[0])
1347 if (strcasecmp(Conf_Server[c].name, Client_ID(client)) == 0)
1348 Conf_Server[c].conn_id = i;
1351 } /* SyncServerStruct */
1355 * Get IP address string of a connection.
1357 * @param Idx Connection index.
1358 * @return Pointer to a global buffer containing the IP address as string.
1361 Conn_GetIPAInfo(CONN_ID Idx)
1364 return ng_ipaddr_tostr(&My_Connections[Idx].addr);
1369 * Send out data of write buffer; connect new sockets.
1371 * @param Idx Connection index.
1372 * @returns true on success, false otherwise.
1375 Handle_Write( CONN_ID Idx )
1380 assert( Idx > NONE );
1381 if ( My_Connections[Idx].sock < 0 ) {
1382 LogDebug("Handle_Write() on closed socket, connection %d", Idx);
1385 assert( My_Connections[Idx].sock > NONE );
1387 wdatalen = array_bytes(&My_Connections[Idx].wbuf );
1390 if (wdatalen == 0) {
1391 /* Write buffer is empty, so we try to flush the compression
1392 * buffer and get some data to work with from there :-) */
1393 if (!Zip_Flush(Idx))
1396 /* Now the write buffer most probably has changed: */
1397 wdatalen = array_bytes(&My_Connections[Idx].wbuf);
1401 if (wdatalen == 0) {
1402 /* Still no data, fine. */
1403 io_event_del(My_Connections[Idx].sock, IO_WANTWRITE );
1409 ("Handle_Write() called for connection %d, %ld bytes pending ...",
1414 if ( Conn_OPTION_ISSET( &My_Connections[Idx], CONN_SSL )) {
1415 len = ConnSSL_Write(&My_Connections[Idx], array_start(&My_Connections[Idx].wbuf), wdatalen);
1419 len = write(My_Connections[Idx].sock,
1420 array_start(&My_Connections[Idx].wbuf), wdatalen );
1423 if (errno == EAGAIN || errno == EINTR)
1426 Log(LOG_ERR, "Write error on connection %d (socket %d): %s!",
1427 Idx, My_Connections[Idx].sock, strerror(errno));
1428 Conn_Close(Idx, "Write error!", NULL, false);
1432 /* move any data not yet written to beginning */
1433 array_moveleft(&My_Connections[Idx].wbuf, 1, (size_t)len);
1436 } /* Handle_Write */
1440 * Count established connections to a specific IP address.
1442 * @returns Number of established connections.
1445 Count_Connections(ng_ipaddr_t *a)
1450 for (i = 0; i < Pool_Size; i++) {
1451 if (My_Connections[i].sock <= NONE)
1453 if (ng_ipaddr_ipequal(&My_Connections[i].addr, a))
1457 } /* Count_Connections */
1461 * Initialize new client connection on a listening socket.
1463 * @param Sock Listening socket descriptor.
1464 * @param IsSSL true if this socket expects SSL-encrypted data.
1465 * @returns Accepted socket descriptor or -1 on error.
1468 New_Connection(int Sock, UNUSED bool IsSSL)
1471 struct request_info req;
1473 ng_ipaddr_t new_addr;
1474 char ip_str[NG_INET_ADDRSTRLEN];
1475 int new_sock, new_sock_len;
1479 assert(Sock > NONE);
1481 LogDebug("Accepting new connection on socket %d ...", Sock);
1483 new_sock_len = (int)sizeof(new_addr);
1484 new_sock = accept(Sock, (struct sockaddr *)&new_addr,
1485 (socklen_t *)&new_sock_len);
1487 Log(LOG_CRIT, "Can't accept connection: %s!", strerror(errno));
1490 NumConnectionsAccepted++;
1492 if (!ng_ipaddr_tostr_r(&new_addr, ip_str)) {
1493 Log(LOG_CRIT, "fd %d: Can't convert IP address!", new_sock);
1494 Simple_Message(new_sock, "ERROR :Internal Server Error");
1500 /* Validate socket using TCP Wrappers */
1501 request_init(&req, RQ_DAEMON, PACKAGE_NAME, RQ_FILE, new_sock,
1502 RQ_CLIENT_SIN, &new_addr, NULL);
1504 if (!hosts_access(&req)) {
1506 "Refused connection from %s (by TCP Wrappers)!", ip_str);
1507 Simple_Message(new_sock, "ERROR :Connection refused");
1513 if (!Init_Socket(new_sock))
1516 /* Check global connection limit */
1517 if ((Conf_MaxConnections > 0) &&
1518 (NumConnections >= (size_t) Conf_MaxConnections)) {
1519 Log(LOG_ALERT, "Can't accept connection: limit (%d) reached!",
1520 Conf_MaxConnections);
1521 Simple_Message(new_sock, "ERROR :Connection limit reached");
1526 /* Check IP-based connection limit */
1527 cnt = Count_Connections(&new_addr);
1528 if ((Conf_MaxConnectionsIP > 0) && (cnt >= Conf_MaxConnectionsIP)) {
1529 /* Access denied, too many connections from this IP address! */
1531 "Refused connection from %s: too may connections (%ld) from this IP address!",
1533 Simple_Message(new_sock,
1534 "ERROR :Connection refused, too many connections from your IP address");
1539 if (new_sock >= Pool_Size) {
1540 if (!array_alloc(&My_ConnArray, sizeof(CONNECTION),
1541 (size_t) new_sock)) {
1543 "Can't allocate memory! [New_Connection]");
1544 Simple_Message(new_sock, "ERROR: Internal error");
1548 LogDebug("Bumped connection pool to %ld items (internal: %ld items, %ld bytes)",
1549 new_sock, array_length(&My_ConnArray,
1550 sizeof(CONNECTION)), array_bytes(&My_ConnArray));
1552 /* Adjust pointer to new block */
1553 My_Connections = array_start(&My_ConnArray);
1554 while (Pool_Size <= new_sock)
1555 Init_Conn_Struct(Pool_Size++);
1558 /* register callback */
1559 if (!io_event_create(new_sock, IO_WANTREAD, cb_clientserver)) {
1561 "Can't accept connection: io_event_create failed!");
1562 Simple_Message(new_sock, "ERROR :Internal error");
1567 c = Client_NewLocal(new_sock, NULL, CLIENT_UNKNOWN, false);
1570 "Can't accept connection: can't create client structure!");
1571 Simple_Message(new_sock, "ERROR :Internal error");
1576 Init_Conn_Struct(new_sock);
1577 My_Connections[new_sock].sock = new_sock;
1578 My_Connections[new_sock].addr = new_addr;
1579 My_Connections[new_sock].client = c;
1581 /* Set initial hostname to IP address. This becomes overwritten when
1582 * the DNS lookup is enabled and succeeds, but is used otherwise. */
1583 if (ng_ipaddr_af(&new_addr) != AF_INET)
1584 snprintf(My_Connections[new_sock].host,
1585 sizeof(My_Connections[new_sock].host), "[%s]", ip_str);
1587 strlcpy(My_Connections[new_sock].host, ip_str,
1588 sizeof(My_Connections[new_sock].host));
1590 Client_SetHostname(c, My_Connections[new_sock].host);
1592 Log(LOG_INFO, "Accepted connection %d from \"%s:%d\" on socket %d.",
1593 new_sock, My_Connections[new_sock].host,
1594 ng_ipaddr_getport(&new_addr), Sock);
1595 Account_Connection();
1598 /* Delay connection initalization until SSL handshake is finished */
1601 Conn_StartLogin(new_sock);
1604 } /* New_Connection */
1608 * Finish connection initialization, start resolver subprocess.
1610 * @param Idx Connection index.
1613 Conn_StartLogin(CONN_ID Idx)
1615 int ident_sock = -1;
1619 /* Nothing to do if DNS (and resolver subprocess) is disabled */
1624 /* Should we make an IDENT request? */
1626 ident_sock = My_Connections[Idx].sock;
1629 if (Conf_NoticeAuth) {
1630 /* Send "NOTICE AUTH" messages to the client */
1633 (void)Conn_WriteStr(Idx,
1634 "NOTICE AUTH :*** Looking up your hostname and checking ident");
1637 (void)Conn_WriteStr(Idx,
1638 "NOTICE AUTH :*** Looking up your hostname");
1639 (void)Handle_Write(Idx);
1642 Resolve_Addr(&My_Connections[Idx].proc_stat, &My_Connections[Idx].addr,
1643 ident_sock, cb_Read_Resolver_Result);
1648 * Update global connection counters.
1651 Account_Connection(void)
1655 if (NumConnections > NumConnectionsMax)
1656 NumConnectionsMax = NumConnections;
1657 LogDebug("Total number of connections now %lu (max %lu).",
1658 NumConnections, NumConnectionsMax);
1659 } /* Account_Connection */
1663 * Translate socket handle into connection index.
1665 * @param Sock Socket handle.
1666 * @returns Connecion index or NONE, if no connection could be found.
1669 Socket2Index( int Sock )
1671 assert( Sock >= 0 );
1673 if( Sock >= Pool_Size || My_Connections[Sock].sock != Sock ) {
1674 /* the Connection was already closed again, likely due to
1676 LogDebug("Socket2Index: can't get connection for socket %d!", Sock);
1680 } /* Socket2Index */
1684 * Read data from the network to the read buffer. If an error occures,
1685 * the socket of this connection will be shut down.
1687 * @param Idx Connection index.
1690 Read_Request( CONN_ID Idx )
1693 static const unsigned int maxbps = COMMAND_LEN / 2;
1694 char readbuf[READBUFFER_LEN];
1697 assert( Idx > NONE );
1698 assert( My_Connections[Idx].sock > NONE );
1701 if ((array_bytes(&My_Connections[Idx].rbuf) >= READBUFFER_LEN) ||
1702 (array_bytes(&My_Connections[Idx].zip.rbuf) >= READBUFFER_LEN))
1704 if (array_bytes(&My_Connections[Idx].rbuf) >= READBUFFER_LEN)
1707 /* Read buffer is full */
1709 "Receive buffer space exhausted (connection %d): %d bytes",
1710 Idx, array_bytes(&My_Connections[Idx].rbuf));
1711 Conn_Close(Idx, "Receive buffer space exhausted", NULL, false);
1716 if (Conn_OPTION_ISSET(&My_Connections[Idx], CONN_SSL))
1717 len = ConnSSL_Read( &My_Connections[Idx], readbuf, sizeof(readbuf));
1720 len = read(My_Connections[Idx].sock, readbuf, sizeof(readbuf));
1722 LogDebug("Client \"%s:%u\" is closing connection %d ...",
1723 My_Connections[Idx].host,
1724 ng_ipaddr_tostr(&My_Connections[Idx].addr), Idx);
1725 Conn_Close(Idx, NULL, "Client closed connection", false);
1730 if( errno == EAGAIN ) return;
1731 Log(LOG_ERR, "Read error on connection %d (socket %d): %s!",
1732 Idx, My_Connections[Idx].sock, strerror(errno));
1733 Conn_Close(Idx, "Read error", "Client closed connection",
1738 if (Conn_OPTION_ISSET(&My_Connections[Idx], CONN_ZIP)) {
1739 if (!array_catb(&My_Connections[Idx].zip.rbuf, readbuf,
1742 "Could not append received data to zip input buffer (connection %d): %d bytes!",
1744 Conn_Close(Idx, "Receive buffer space exhausted", NULL,
1751 if (!array_catb( &My_Connections[Idx].rbuf, readbuf, len)) {
1753 "Could not append received data to input buffer (connection %d): %d bytes!",
1755 Conn_Close(Idx, "Receive buffer space exhausted", NULL, false );
1759 /* Update connection statistics */
1760 My_Connections[Idx].bytes_in += len;
1761 My_Connections[Idx].bps += Handle_Buffer(Idx);
1763 /* Make sure that there is still a valid client registered */
1764 c = Conn_GetClient(Idx);
1768 /* Update timestamp of last data received if this connection is
1769 * registered as a user, server or service connection. Don't update
1770 * otherwise, so users have at least Conf_PongTimeout seconds time to
1771 * register with the IRC server -- see Check_Connections().
1772 * Update "lastping", too, if time shifted backwards ... */
1773 if (Client_Type(c) == CLIENT_USER
1774 || Client_Type(c) == CLIENT_SERVER
1775 || Client_Type(c) == CLIENT_SERVICE) {
1777 if (My_Connections[Idx].lastdata != t)
1778 My_Connections[Idx].bps = 0;
1780 My_Connections[Idx].lastdata = t;
1781 if (My_Connections[Idx].lastping > t)
1782 My_Connections[Idx].lastping = t;
1785 /* Look at the data in the (read-) buffer of this connection */
1786 if (Client_Type(c) != CLIENT_SERVER
1787 && Client_Type(c) != CLIENT_UNKNOWNSERVER
1788 && Client_Type(c) != CLIENT_SERVICE
1789 && My_Connections[Idx].bps >= maxbps) {
1790 LogDebug("Throttling connection %d: BPS exceeded! (%u >= %u)",
1791 Idx, My_Connections[Idx].bps, maxbps);
1792 Conn_SetPenalty(Idx, 1);
1794 } /* Read_Request */
1798 * Handle all data in the connection read-buffer.
1800 * Data is processed until no complete command is left in the read buffer,
1801 * or MAX_COMMANDS[_SERVER|_SERVICE] commands were processed.
1802 * When a fatal error occurs, the connection is shut down.
1804 * @param Idx Index of the connection.
1805 * @returns Number of bytes processed.
1808 Handle_Buffer(CONN_ID Idx)
1811 char *ptr1, *ptr2, *first_eol;
1819 unsigned int i, maxcmd = MAX_COMMANDS, len_processed = 0;
1822 c = Conn_GetClient(Idx);
1823 starttime = time(NULL);
1827 /* Servers get special command limits that depend on the user count */
1828 switch (Client_Type(c)) {
1830 maxcmd = (int)(Client_UserCount() / 5)
1831 + MAX_COMMANDS_SERVER_MIN;
1832 /* Allow servers to handle even more commands while peering
1833 * to speed up server login and network synchronisation. */
1834 if (Conn_LastPing(Idx) == 0)
1837 case CLIENT_SERVICE:
1838 maxcmd = MAX_COMMANDS_SERVICE; break;
1841 for (i=0; i < maxcmd; i++) {
1843 if (My_Connections[Idx].delaytime > starttime)
1846 /* Unpack compressed data, if compression is in use */
1847 if (Conn_OPTION_ISSET(&My_Connections[Idx], CONN_ZIP)) {
1848 /* When unzipping fails, Unzip_Buffer() shuts
1849 * down the connection itself */
1850 if (!Unzip_Buffer(Idx))
1855 if (0 == array_bytes(&My_Connections[Idx].rbuf))
1858 /* Make sure that the buffer is NULL terminated */
1859 if (!array_cat0_temporary(&My_Connections[Idx].rbuf)) {
1860 Conn_Close(Idx, NULL,
1861 "Can't allocate memory [Handle_Buffer]",
1866 /* RFC 2812, section "2.3 Messages", 5th paragraph:
1867 * "IRC messages are always lines of characters terminated
1868 * with a CR-LF (Carriage Return - Line Feed) pair [...]". */
1870 ptr = strstr(array_start(&My_Connections[Idx].rbuf), "\r\n");
1873 /* Check for non-RFC-compliant request (only CR or LF)?
1874 * Unfortunately, there are quite a few clients out there
1875 * that do this -- e. g. mIRC, BitchX, and Trillian :-( */
1876 ptr1 = strchr(array_start(&My_Connections[Idx].rbuf), '\r');
1877 ptr2 = strchr(array_start(&My_Connections[Idx].rbuf), '\n');
1879 /* Check if there is a single CR or LF _before_ the
1880 * corerct CR+LF line terminator: */
1881 first_eol = ptr1 < ptr2 ? ptr1 : ptr2;
1882 if (first_eol < ptr) {
1883 /* Single CR or LF before CR+LF found */
1887 } else if (ptr1 || ptr2) {
1888 /* No CR+LF terminated command found, but single
1889 * CR or LF found ... */
1891 ptr = ptr1 < ptr2 ? ptr1 : ptr2;
1893 ptr = ptr1 ? ptr1 : ptr2;
1901 /* Complete (=line terminated) request found, handle it! */
1904 len = ptr - (char *)array_start(&My_Connections[Idx].rbuf) + delta;
1906 if (len > (COMMAND_LEN - 1)) {
1907 /* Request must not exceed 512 chars (incl. CR+LF!),
1908 * see RFC 2812. Disconnect Client if this happens. */
1910 "Request too long (connection %d): %d bytes (max. %d expected)!",
1911 Idx, array_bytes(&My_Connections[Idx].rbuf),
1913 Conn_Close(Idx, NULL, "Request too long", true);
1917 len_processed += (unsigned int)len;
1919 /* Request is empty (only '\r\n', '\r' or '\n');
1920 * delta is 2 ('\r\n') or 1 ('\r' or '\n'), see above */
1921 array_moveleft(&My_Connections[Idx].rbuf, 1, len);
1925 /* remember if stream is already compressed */
1926 old_z = My_Connections[Idx].options & CONN_ZIP;
1929 My_Connections[Idx].msg_in++;
1931 (Idx, (char *)array_start(&My_Connections[Idx].rbuf)))
1932 return 0; /* error -> connection has been closed */
1934 array_moveleft(&My_Connections[Idx].rbuf, 1, len);
1936 LogDebug("Connection %d: %d bytes left in read buffer.",
1937 Idx, array_bytes(&My_Connections[Idx].rbuf));
1940 if ((!old_z) && (My_Connections[Idx].options & CONN_ZIP) &&
1941 (array_bytes(&My_Connections[Idx].rbuf) > 0)) {
1942 /* The last command activated socket compression.
1943 * Data that was read after that needs to be copied
1944 * to the unzip buffer for decompression: */
1946 (&My_Connections[Idx].zip.rbuf,
1947 &My_Connections[Idx].rbuf)) {
1948 Conn_Close(Idx, NULL,
1949 "Can't allocate memory [Handle_Buffer]",
1954 array_trunc(&My_Connections[Idx].rbuf);
1956 ("Moved already received data (%u bytes) to uncompression buffer.",
1957 array_bytes(&My_Connections[Idx].zip.rbuf));
1961 return len_processed;
1962 } /* Handle_Buffer */
1966 * Check whether established connections are still alive or not.
1967 * If not, play PING-PONG first; and if that doesn't help either,
1968 * disconnect the respective peer.
1971 Check_Connections(void)
1977 for (i = 0; i < Pool_Size; i++) {
1978 if (My_Connections[i].sock < 0)
1981 c = Conn_GetClient(i);
1982 if (c && ((Client_Type(c) == CLIENT_USER)
1983 || (Client_Type(c) == CLIENT_SERVER)
1984 || (Client_Type(c) == CLIENT_SERVICE))) {
1985 /* connected User, Server or Service */
1986 if (My_Connections[i].lastping >
1987 My_Connections[i].lastdata) {
1988 /* We already sent a ping */
1989 if (My_Connections[i].lastping <
1990 time(NULL) - Conf_PongTimeout) {
1992 snprintf(msg, sizeof(msg),
1993 "Ping timeout: %d seconds",
1995 LogDebug("Connection %d: %s.", i, msg);
1996 Conn_Close(i, NULL, msg, true);
1998 } else if (My_Connections[i].lastdata <
1999 time(NULL) - Conf_PingTimeout) {
2000 /* We need to send a PING ... */
2001 LogDebug("Connection %d: sending PING ...", i);
2003 Conn_WriteStr(i, "PING :%s",
2004 Client_ID(Client_ThisServer()));
2007 /* The connection is not fully established yet, so
2008 * we don't do the PING-PONG game here but instead
2009 * disconnect the client after "a short time" if it's
2010 * still not registered. */
2012 if (My_Connections[i].lastdata <
2013 time(NULL) - Conf_PongTimeout) {
2015 ("Unregistered connection %d timed out ...",
2017 Conn_Close(i, NULL, "Timeout", false);
2021 } /* Check_Connections */
2025 * Check if further server links should be established.
2033 time_now = time(NULL);
2035 /* Check all configured servers */
2036 for (i = 0; i < MAX_SERVERS; i++) {
2037 if (Conf_Server[i].conn_id != NONE)
2038 continue; /* Already establishing or connected */
2039 if (!Conf_Server[i].host[0] || !Conf_Server[i].port > 0)
2040 continue; /* No host and/or port configured */
2041 if (Conf_Server[i].flags & CONF_SFLAG_DISABLED)
2042 continue; /* Disabled configuration entry */
2043 if (Conf_Server[i].lasttry > (time_now - Conf_ConnectRetry))
2044 continue; /* We have to wait a little bit ... */
2046 /* Is there already a connection in this group? */
2047 if (Conf_Server[i].group > NONE) {
2048 for (n = 0; n < MAX_SERVERS; n++) {
2051 if ((Conf_Server[n].conn_id != NONE) &&
2052 (Conf_Server[n].group == Conf_Server[i].group))
2055 if (n < MAX_SERVERS)
2059 /* Okay, try to connect now */
2061 "Preparing to establish a new server link for \"%s\" ...",
2062 Conf_Server[i].name);
2063 Conf_Server[i].lasttry = time_now;
2064 Conf_Server[i].conn_id = SERVER_WAIT;
2065 assert(Proc_GetPipeFd(&Conf_Server[i].res_stat) < 0);
2066 Resolve_Name(&Conf_Server[i].res_stat, Conf_Server[i].host,
2067 cb_Connect_to_Server);
2069 } /* Check_Servers */
2073 * Establish a new outgoing server connection.
2075 * @param Server Configuration index of the server.
2076 * @param dest Destination IP address to connect to.
2079 New_Server( int Server , ng_ipaddr_t *dest)
2081 /* Establish new server link */
2082 char ip_str[NG_INET_ADDRSTRLEN];
2083 int af_dest, res, new_sock;
2086 assert( Server > NONE );
2088 /* Make sure that the remote server hasn't re-linked to this server
2089 * asynchronously on its own */
2090 if (Conf_Server[Server].conn_id > NONE) {
2092 "Connection to \"%s\" meanwhile re-established, aborting preparation.");
2096 if (!ng_ipaddr_tostr_r(dest, ip_str)) {
2097 Log(LOG_WARNING, "New_Server: Could not convert IP to string");
2101 af_dest = ng_ipaddr_af(dest);
2102 new_sock = socket(af_dest, SOCK_STREAM, 0);
2105 "Establishing connection for \"%s\" to \"%s:%d\" (%s), socket %d ...",
2106 Conf_Server[Server].name, Conf_Server[Server].host,
2107 Conf_Server[Server].port, ip_str, new_sock);
2110 Log(LOG_CRIT, "Can't create socket (af %d): %s!",
2111 af_dest, strerror(errno));
2115 if (!Init_Socket(new_sock))
2118 /* is a bind address configured? */
2119 res = ng_ipaddr_af(&Conf_Server[Server].bind_addr);
2120 /* if yes, bind now. If it fails, warn and let connect() pick a source address */
2121 if (res && bind(new_sock, (struct sockaddr *) &Conf_Server[Server].bind_addr,
2122 ng_ipaddr_salen(&Conf_Server[Server].bind_addr)))
2124 ng_ipaddr_tostr_r(&Conf_Server[Server].bind_addr, ip_str);
2125 Log(LOG_WARNING, "Can't bind socket to %s: %s!", ip_str, strerror(errno));
2127 ng_ipaddr_setport(dest, Conf_Server[Server].port);
2128 res = connect(new_sock, (struct sockaddr *) dest, ng_ipaddr_salen(dest));
2129 if(( res != 0 ) && ( errno != EINPROGRESS )) {
2130 Log( LOG_CRIT, "Can't connect socket: %s!", strerror( errno ));
2135 if (!array_alloc(&My_ConnArray, sizeof(CONNECTION), (size_t)new_sock)) {
2137 "Cannot allocate memory for server connection (socket %d)",
2143 if (!io_event_create( new_sock, IO_WANTWRITE, cb_connserver)) {
2144 Log(LOG_ALERT, "io_event_create(): could not add fd %d", strerror(errno));
2149 My_Connections = array_start(&My_ConnArray);
2151 assert(My_Connections[new_sock].sock <= 0);
2153 Init_Conn_Struct(new_sock);
2155 ng_ipaddr_tostr_r(dest, ip_str);
2156 c = Client_NewLocal(new_sock, ip_str, CLIENT_UNKNOWNSERVER, false);
2158 Log( LOG_ALERT, "Can't establish connection: can't create client structure!" );
2163 /* Conn_Close() decrements this counter again */
2164 Account_Connection();
2165 Client_SetIntroducer( c, c );
2166 Client_SetToken( c, TOKEN_OUTBOUND );
2168 /* Register connection */
2169 if (!Conf_SetServer(Server, new_sock))
2171 My_Connections[new_sock].sock = new_sock;
2172 My_Connections[new_sock].addr = *dest;
2173 My_Connections[new_sock].client = c;
2174 strlcpy( My_Connections[new_sock].host, Conf_Server[Server].host,
2175 sizeof(My_Connections[new_sock].host ));
2178 if (Conf_Server[Server].SSLConnect && !ConnSSL_PrepareConnect( &My_Connections[new_sock],
2179 &Conf_Server[Server] ))
2181 Log(LOG_ALERT, "Could not initialize SSL for outgoing connection");
2182 Conn_Close( new_sock, "Could not initialize SSL for outgoing connection", NULL, false );
2183 Init_Conn_Struct( new_sock );
2184 Conf_Server[Server].conn_id = NONE;
2188 LogDebug("Registered new connection %d on socket %d (%ld in total).",
2189 new_sock, My_Connections[new_sock].sock, NumConnections);
2190 Conn_OPTION_ADD( &My_Connections[new_sock], CONN_ISCONNECTING );
2195 * Initialize connection structure.
2197 * @param Idx Connection index.
2200 Init_Conn_Struct(CONN_ID Idx)
2202 time_t now = time(NULL);
2204 memset(&My_Connections[Idx], 0, sizeof(CONNECTION));
2205 My_Connections[Idx].sock = -1;
2206 My_Connections[Idx].signon = now;
2207 My_Connections[Idx].lastdata = now;
2208 My_Connections[Idx].lastprivmsg = now;
2209 Proc_InitStruct(&My_Connections[Idx].proc_stat);
2212 My_Connections[Idx].iconv_from = (iconv_t)(-1);
2213 My_Connections[Idx].iconv_to = (iconv_t)(-1);
2215 } /* Init_Conn_Struct */
2219 * Initialize options of a new socket.
2221 * For example, we try to set socket options SO_REUSEADDR and IPTOS_LOWDELAY.
2222 * The socket is automatically closed if a fatal error is encountered.
2224 * @param Sock Socket handle.
2225 * @returns false if socket was closed due to fatal error.
2228 Init_Socket( int Sock )
2232 if (!io_setnonblock(Sock)) {
2233 Log( LOG_CRIT, "Can't enable non-blocking mode for socket: %s!", strerror( errno ));
2238 /* Don't block this port after socket shutdown */
2240 if( setsockopt( Sock, SOL_SOCKET, SO_REUSEADDR, &value, (socklen_t)sizeof( value )) != 0 )
2242 Log( LOG_ERR, "Can't set socket option SO_REUSEADDR: %s!", strerror( errno ));
2243 /* ignore this error */
2246 /* Set type of service (TOS) */
2247 #if defined(IPPROTO_IP) && defined(IPTOS_LOWDELAY)
2248 value = IPTOS_LOWDELAY;
2249 if (setsockopt(Sock, IPPROTO_IP, IP_TOS, &value,
2250 (socklen_t) sizeof(value))) {
2251 LogDebug("Can't set socket option IP_TOS: %s!",
2253 /* ignore this error */
2255 LogDebug("IP_TOS on socket %d has been set to IPTOS_LOWDELAY.",
2264 * Read results of a resolver sub-process and try to initiate a new server
2267 * @param fd File descriptor of the pipe to the sub-process.
2268 * @param events (ignored IO specification)
2271 cb_Connect_to_Server(int fd, UNUSED short events)
2273 /* Read result of resolver sub-process from pipe and start connection */
2276 ng_ipaddr_t dest_addrs[4]; /* we can handle at most 3; but we read up to
2277 four so we can log the 'more than we can handle'
2278 condition. First result is tried immediately, rest
2279 is saved for later if needed. */
2281 LogDebug("Resolver: Got forward lookup callback on fd %d, events %d", fd, events);
2283 for (i=0; i < MAX_SERVERS; i++) {
2284 if (Proc_GetPipeFd(&Conf_Server[i].res_stat) == fd )
2288 if( i >= MAX_SERVERS) {
2289 /* Ops, no matching server found?! */
2291 LogDebug("Resolver: Got Forward Lookup callback for unknown server!?");
2295 /* Read result from pipe */
2296 len = Proc_Read(&Conf_Server[i].res_stat, dest_addrs, sizeof(dest_addrs));
2297 Proc_Close(&Conf_Server[i].res_stat);
2299 /* Error resolving hostname: reset server structure */
2300 Conf_Server[i].conn_id = NONE;
2304 assert((len % sizeof(ng_ipaddr_t)) == 0);
2306 LogDebug("Got result from resolver: %u structs (%u bytes).", len/sizeof(ng_ipaddr_t), len);
2308 memset(&Conf_Server[i].dst_addr, 0, sizeof(Conf_Server[i].dst_addr));
2309 if (len > sizeof(ng_ipaddr_t)) {
2310 /* more than one address for this hostname, remember them
2311 * in case first address is unreachable/not available */
2312 len -= sizeof(ng_ipaddr_t);
2313 if (len > sizeof(Conf_Server[i].dst_addr)) {
2314 len = sizeof(Conf_Server[i].dst_addr);
2316 "Notice: Resolver returned more IP Addresses for host than we can handle, additional addresses dropped.");
2318 memcpy(&Conf_Server[i].dst_addr, &dest_addrs[1], len);
2321 New_Server(i, dest_addrs);
2322 } /* cb_Read_Forward_Lookup */
2326 * Read results of a resolver sub-process from the pipe and update the
2327 * apropriate connection/client structure(s): hostname and/or IDENT user name.
2329 * @param r_fd File descriptor of the pipe to the sub-process.
2330 * @param events (ignored IO specification)
2333 cb_Read_Resolver_Result( int r_fd, UNUSED short events )
2340 char readbuf[HOST_LEN + 2 + CLIENT_USER_LEN];
2343 char readbuf[HOST_LEN + 1];
2346 LogDebug("Resolver: Got callback on fd %d, events %d", r_fd, events );
2347 i = Conn_GetFromProc(r_fd);
2349 /* Ops, none found? Probably the connection has already
2350 * been closed!? We'll ignore that ... */
2352 LogDebug("Resolver: Got callback for unknown connection!?");
2356 /* Read result from pipe */
2357 len = Proc_Read(&My_Connections[i].proc_stat, readbuf, sizeof readbuf -1);
2358 Proc_Close(&My_Connections[i].proc_stat);
2362 readbuf[len] = '\0';
2363 identptr = strchr(readbuf, '\n');
2364 assert(identptr != NULL);
2366 Log( LOG_CRIT, "Resolver: Got malformed result!");
2371 LogDebug("Got result from resolver: \"%s\" (%u bytes read).", readbuf, len);
2372 /* Okay, we got a complete result: this is a host name for outgoing
2373 * connections and a host name and IDENT user name (if enabled) for
2374 * incoming connections.*/
2375 assert ( My_Connections[i].sock >= 0 );
2376 /* Incoming connection. Search client ... */
2377 c = Conn_GetClient( i );
2378 assert( c != NULL );
2380 /* Only update client information of unregistered clients.
2381 * Note: user commands (e. g. WEBIRC) are always read _after_ reading
2382 * the resolver results, so we don't have to worry to override settings
2383 * from these commands here. */
2384 if(Client_Type(c) == CLIENT_UNKNOWN) {
2385 strlcpy(My_Connections[i].host, readbuf,
2386 sizeof(My_Connections[i].host));
2387 Client_SetHostname(c, readbuf);
2388 if (Conf_NoticeAuth)
2389 (void)Conn_WriteStr(i,
2390 "NOTICE AUTH :*** Found your hostname: %s",
2391 My_Connections[i].host);
2397 if ((*ptr < '0' || *ptr > '9') &&
2398 (*ptr < 'A' || *ptr > 'Z') &&
2399 (*ptr < 'a' || *ptr > 'z'))
2404 /* Erroneous IDENT reply */
2406 "Got invalid IDENT reply for connection %d! Ignored.",
2410 "IDENT lookup for connection %d: \"%s\".",
2412 Client_SetUser(c, identptr, true);
2414 if (Conf_NoticeAuth) {
2415 (void)Conn_WriteStr(i,
2416 "NOTICE AUTH :*** Got %sident response%s%s",
2417 *ptr ? "invalid " : "",
2419 *ptr ? "" : identptr);
2422 Log(LOG_INFO, "IDENT lookup for connection %d: no result.", i);
2423 if (Conf_NoticeAuth && Conf_Ident)
2424 (void)Conn_WriteStr(i,
2425 "NOTICE AUTH :*** No ident response");
2429 if (Conf_NoticeAuth)
2430 (void)Handle_Write(i);
2432 Class_HandleServerBans(c);
2435 else Log( LOG_DEBUG, "Resolver: discarding result for already registered connection %d.", i );
2437 } /* cb_Read_Resolver_Result */
2441 * Write a "simple" (error) message to a socket.
2443 * The message is sent without using the connection write buffers, without
2444 * compression/encryption, and even without any error reporting. It is
2445 * designed for error messages of e.g. New_Connection().
2447 * @param Sock Socket handle.
2448 * @param Msg Message string to send.
2451 Simple_Message(int Sock, const char *Msg)
2453 char buf[COMMAND_LEN];
2456 assert(Sock > NONE);
2457 assert(Msg != NULL);
2459 strlcpy(buf, Msg, sizeof buf - 2);
2460 len = strlcat(buf, "\r\n", sizeof buf);
2461 if (write(Sock, buf, len) < 0) {
2462 /* Because this function most probably got called to log
2463 * an error message, any write error is ignored here to
2464 * avoid an endless loop. But casting the result of write()
2465 * to "void" doesn't satisfy the GNU C code attribute
2466 * "warn_unused_result" which is used by some versions of
2467 * glibc (e.g. 2.11.1), therefore this silly error
2468 * "handling" code here :-( */
2471 } /* Simple_Error */
2475 * Get CLIENT structure that belongs to a local connection identified by its
2476 * index number. Each connection belongs to a client by definition, so it is
2477 * not required that the caller checks for NULL return values.
2479 * @param Idx Connection index number.
2480 * @returns Pointer to CLIENT structure.
2483 Conn_GetClient( CONN_ID Idx )
2488 c = array_get(&My_ConnArray, sizeof (CONNECTION), (size_t)Idx);
2490 return c ? c->client : NULL;
2494 * Get PROC_STAT sub-process structure of a connection.
2496 * @param Idx Connection index number.
2497 * @returns PROC_STAT structure.
2500 Conn_GetProcStat(CONN_ID Idx)
2505 c = array_get(&My_ConnArray, sizeof (CONNECTION), (size_t)Idx);
2507 return &c->proc_stat;
2508 } /* Conn_GetProcStat */
2512 * Get CONN_ID from file descriptor associated to a subprocess structure.
2514 * @param fd File descriptor.
2515 * @returns CONN_ID or NONE (-1).
2518 Conn_GetFromProc(int fd)
2523 for (i = 0; i < Pool_Size; i++) {
2524 if ((My_Connections[i].sock != NONE)
2525 && (Proc_GetPipeFd(&My_Connections[i].proc_stat) == fd))
2529 } /* Conn_GetFromProc */
2535 Conn_GetAuthPing(CONN_ID Idx)
2537 assert (Idx != NONE);
2538 return My_Connections[Idx].auth_ping;
2539 } /* Conn_GetAuthPing */
2542 Conn_SetAuthPing(CONN_ID Idx, long ID)
2544 assert (Idx != NONE);
2545 My_Connections[Idx].auth_ping = ID;
2546 } /* Conn_SetAuthPing */
2554 * Get information about used SSL chiper.
2556 * @param Idx Connection index number.
2557 * @param buf Buffer for returned information text.
2558 * @param len Size of return buffer "buf".
2559 * @returns true on success, false otherwise.
2562 Conn_GetCipherInfo(CONN_ID Idx, char *buf, size_t len)
2566 assert(Idx < (int) array_length(&My_ConnArray, sizeof(CONNECTION)));
2567 return ConnSSL_GetCipherInfo(&My_Connections[Idx], buf, len);
2572 * Check if a connection is SSL-enabled or not.
2574 * @param Idx Connection index number.
2575 * @return true if connection is SSL-enabled, false otherwise.
2578 Conn_UsesSSL(CONN_ID Idx)
2582 assert(Idx < (int) array_length(&My_ConnArray, sizeof(CONNECTION)));
2583 return Conn_OPTION_ISSET(&My_Connections[Idx], CONN_SSL);
2592 * Dump internal state of the "connection module".
2595 Conn_DebugDump(void)
2599 Log(LOG_DEBUG, "Connection status:");
2600 for (i = 0; i < Pool_Size; i++) {
2601 if (My_Connections[i].sock == NONE)
2604 " - %d: host=%s, lastdata=%ld, lastping=%ld, delaytime=%ld, flag=%d, options=%d, bps=%d, client=%s",
2605 My_Connections[i].sock, My_Connections[i].host,
2606 My_Connections[i].lastdata, My_Connections[i].lastping,
2607 My_Connections[i].delaytime, My_Connections[i].flag,
2608 My_Connections[i].options, My_Connections[i].bps,
2609 My_Connections[i].client ? Client_ID(My_Connections[i].client) : "-");
2611 } /* Conn_DumpClients */