X-Git-Url: https://arthur.barton.de/cgi-bin/gitweb.cgi?p=ngircd-alex.git;a=blobdiff_plain;f=src%2Fngircd%2Fconn.c;h=1696d5c5f62968d8d495576b4e1bc67947db66ee;hp=5e672ff3f3d86a2aefd39d6ead5369421f1a20f2;hb=22fa782be7840dae825be43e9ac8d8476d80f08c;hpb=00ab67dcdb96f64e8ba1951bfb88e49372576990 diff --git a/src/ngircd/conn.c b/src/ngircd/conn.c index 5e672ff3..1696d5c5 100644 --- a/src/ngircd/conn.c +++ b/src/ngircd/conn.c @@ -1,6 +1,6 @@ /* * ngIRCd -- The Next Generation IRC Daemon - * Copyright (c)2001-2005 Alexander Barton + * Copyright (c)2001-2007 Alexander Barton (alex@barton.de) * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by @@ -17,7 +17,7 @@ #include "portab.h" #include "io.h" -static char UNUSED id[] = "$Id: conn.c,v 1.196 2006/05/12 11:53:04 alex Exp $"; +static char UNUSED id[] = "$Id: conn.c,v 1.221 2008/02/26 22:04:17 fw Exp $"; #include "imp.h" #include @@ -41,12 +41,6 @@ static char UNUSED id[] = "$Id: conn.c,v 1.196 2006/05/12 11:53:04 alex Exp $"; # include #endif -#ifdef HAVE_ARPA_INET_H -# include -#else -# define PF_INET AF_INET -#endif - #ifdef HAVE_STDINT_H # include /* e.g. for Mac OS X */ #endif @@ -83,6 +77,7 @@ static char UNUSED id[] = "$Id: conn.c,v 1.196 2006/05/12 11:53:04 alex Exp $"; static bool Handle_Write PARAMS(( CONN_ID Idx )); +static bool Conn_Write PARAMS(( CONN_ID Idx, char *Data, size_t Len )); static int New_Connection PARAMS(( int Sock )); static CONN_ID Socket2Index PARAMS(( int Sock )); static void Read_Request PARAMS(( CONN_ID Idx )); @@ -91,10 +86,9 @@ static void Check_Connections PARAMS(( void )); static void Check_Servers PARAMS(( void )); static void Init_Conn_Struct PARAMS(( CONN_ID Idx )); static bool Init_Socket PARAMS(( int Sock )); -static void New_Server PARAMS(( int Server )); +static void New_Server PARAMS(( int Server, ng_ipaddr_t *dest )); static void Simple_Message PARAMS(( int Sock, const char *Msg )); -static int Count_Connections PARAMS(( struct sockaddr_in addr )); -static int NewListener PARAMS(( const UINT16 Port )); +static int NewListener PARAMS(( int af, const UINT16 Port )); static array My_Listeners; static array My_ConnArray; @@ -123,7 +117,6 @@ cb_connserver(int sock, UNUSED short what) { int res, err; socklen_t sock_len; - CLIENT *c; CONN_ID idx = Socket2Index( sock ); if (idx <= NONE) { LogDebug("cb_connserver wants to write on unknown socket?!"); @@ -150,17 +143,28 @@ cb_connserver(int sock, UNUSED short what) Conf_Server[Conf_GetServer(idx)].port, idx, strerror(err)); - /* Clean up the CLIENT structure (to avoid silly log - * messages) and call Conn_Close() to do the rest. */ - c = Conn_GetClient(idx); - if (c) - Client_DestroyNow(c); - - Conn_Close(idx, "Can't connect!", NULL, false); - + res = Conf_GetServer(idx); + assert(res >= 0); + + Conn_Close(idx, "Can't connect!", NULL, false); + + if (res < 0) + return; + if (ng_ipaddr_af(&Conf_Server[res].dst_addr[0])) { + /* more addresses to try... */ + New_Server(res, &Conf_Server[res].dst_addr[0]); + /* connection to dst_addr[0] in progress, remove this address... */ + Conf_Server[res].dst_addr[0] = Conf_Server[res].dst_addr[1]; + + memset(&Conf_Server[res].dst_addr[1], 0, sizeof(&Conf_Server[res].dst_addr[1])); + } return; } + res = Conf_GetServer(idx); + assert(res >= 0); + if (res >= 0) /* connect succeeded, remove all additional addresses */ + memset(&Conf_Server[res].dst_addr, 0, sizeof(&Conf_Server[res].dst_addr)); Conn_OPTION_DEL( &My_Connections[idx], CONN_ISCONNECTING ); server_login(idx); } @@ -267,10 +271,10 @@ Conn_Exit( void ) } /* Conn_Exit */ -static int -ports_initlisteners(array *a, void (*func)(int,short)) +static unsigned int +ports_initlisteners(array *a, int af, void (*func)(int,short)) { - int created = 0; + unsigned int created = 0; size_t len; int fd; UINT16 *port; @@ -278,7 +282,7 @@ ports_initlisteners(array *a, void (*func)(int,short)) len = array_length(a, sizeof (UINT16)); port = array_start(a); while(len--) { - fd = NewListener( *port ); + fd = NewListener(af, *port); if (fd < 0) { port++; continue; @@ -298,19 +302,24 @@ ports_initlisteners(array *a, void (*func)(int,short)) } -GLOBAL int +GLOBAL unsigned int Conn_InitListeners( void ) { /* Initialize ports on which the server should accept connections */ - int created; + unsigned int created = 0; if (!io_library_init(CONNECTION_POOL)) { Log(LOG_EMERG, "Cannot initialize IO routines: %s", strerror(errno)); return -1; } - created = ports_initlisteners(&Conf_ListenPorts, cb_listen); +#ifdef WANT_IPV6 + if (Conf_ListenIPv6) + created = ports_initlisteners(&Conf_ListenPorts, AF_INET6, cb_listen); +#endif + if (Conf_ListenIPv4) + created += ports_initlisteners(&Conf_ListenPorts, AF_INET, cb_listen); return created; } /* Conn_InitListeners */ @@ -340,51 +349,76 @@ Conn_ExitListeners( void ) } /* Conn_ExitListeners */ +static bool +InitSinaddrListenAddr(int af, ng_ipaddr_t *addr, UINT16 Port) +{ + bool ret; + const char *listen_addrstr = NULL; +#ifdef WANT_IPV6 + if (af == AF_INET) + listen_addrstr = "0.0.0.0"; +#else + (void)af; +#endif + if (Conf_ListenAddress[0]) /* overrides V4/V6 atm */ + listen_addrstr = Conf_ListenAddress; + + ret = ng_ipaddr_init(addr, listen_addrstr, Port); + if (!ret) { + if (!listen_addrstr) + listen_addrstr = ""; + Log(LOG_CRIT, "Can't bind to %s:%u: can't convert ip address \"%s\"", + listen_addrstr, Port, listen_addrstr); + } + return ret; +} + + +static void +set_v6_only(int af, int sock) +{ +#if defined(IPV6_V6ONLY) && defined(WANT_IPV6) + int on = 1; + + if (af != AF_INET6) + return; + + if (setsockopt(sock, IPPROTO_IPV6, IPV6_V6ONLY, &on, sizeof(on))) + Log(LOG_ERR, "Could not set IPV6_V6ONLY: %s", strerror(errno)); +#else + (void)af; + (void)sock; +#endif +} + + /* return new listening port file descriptor or -1 on failure */ static int -NewListener( const UINT16 Port ) +NewListener(int af, const UINT16 Port) { /* Create new listening socket on specified port */ - - struct sockaddr_in addr; - struct in_addr inaddr; + ng_ipaddr_t addr; int sock; #ifdef ZEROCONF char name[CLIENT_ID_LEN], *info; #endif + if (!InitSinaddrListenAddr(af, &addr, Port)) + return -1; - /* Server-"Listen"-Socket initialisieren */ - memset( &addr, 0, sizeof( addr )); - memset( &inaddr, 0, sizeof( inaddr )); - addr.sin_family = (sa_family_t)AF_INET; - addr.sin_port = htons( Port ); - if( Conf_ListenAddress[0] ) - { -#ifdef HAVE_INET_ATON - if( inet_aton( Conf_ListenAddress, &inaddr ) == 0 ) -#else - inaddr.s_addr = inet_addr( Conf_ListenAddress ); - if( inaddr.s_addr == (unsigned)-1 ) -#endif - { - Log( LOG_CRIT, "Can't listen on %s:%u: can't convert ip address %s!", - Conf_ListenAddress, Port, Conf_ListenAddress ); - return -1; - } - } - else inaddr.s_addr = htonl( INADDR_ANY ); - addr.sin_addr = inaddr; - - sock = socket( PF_INET, SOCK_STREAM, 0); + sock = socket(ng_ipaddr_af(&addr), SOCK_STREAM, 0); if( sock < 0 ) { Log( LOG_CRIT, "Can't create socket: %s!", strerror( errno )); return -1; } + af = ng_ipaddr_af(&addr); + + set_v6_only(af, sock); + if( ! Init_Socket( sock )) return -1; - if (bind(sock, (struct sockaddr *)&addr, (socklen_t)sizeof(addr)) != 0) { - Log( LOG_CRIT, "Can't bind socket: %s!", strerror( errno )); + if (bind(sock, (struct sockaddr *)&addr, ng_ipaddr_salen(&addr)) != 0) { + Log( LOG_CRIT, "Can't bind socket (port %d) : %s!", Port, strerror( errno )); close( sock ); return -1; } @@ -402,8 +436,12 @@ NewListener( const UINT16 Port ) return -1; } - if( Conf_ListenAddress[0]) Log( LOG_INFO, "Now listening on %s:%d (socket %d).", Conf_ListenAddress, Port, sock ); - else Log( LOG_INFO, "Now listening on 0.0.0.0:%d (socket %d).", Port, sock ); +#ifdef WANT_IPV6 + if (af == AF_INET6) + Log(LOG_INFO, "Now listening on [%s]:%d (socket %d).", ng_ipaddr_tostr(&addr), Port, sock); + else +#endif + Log(LOG_INFO, "Now listening on %s:%d (socket %d).", ng_ipaddr_tostr(&addr), Port, sock); #ifdef ZEROCONF /* Get best server description text */ @@ -615,51 +653,74 @@ va_dcl } /* Conn_WriteStr */ -GLOBAL bool +/** + * Append Data to the outbound write buffer of a connection. + * @param Idx Index of the connection. + * @param Data pointer to the data. + * @param Len length of Data. + * @return true on success, false otherwise. + */ +static bool Conn_Write( CONN_ID Idx, char *Data, size_t Len ) { - /* Daten in Socket schreiben. Bei "fatalen" Fehlern wird - * der Client disconnectiert und false geliefert. */ - + CLIENT *c; + size_t writebuf_limit = WRITEBUFFER_LEN; assert( Idx > NONE ); assert( Data != NULL ); assert( Len > 0 ); - /* Ist der entsprechende Socket ueberhaupt noch offen? In einem - * "Handler-Durchlauf" kann es passieren, dass dem nicht mehr so - * ist, wenn einer von mehreren Conn_Write()'s fehlgeschlagen ist. - * In diesem Fall wird hier einfach ein Fehler geliefert. */ - if( My_Connections[Idx].sock <= NONE ) { - LogDebug("Skipped write on closed socket (connection %d).", Idx ); - return false; - } + c = Conn_GetClient(Idx); + assert( c != NULL); - /* Pruefen, ob im Schreibpuffer genuegend Platz ist. Ziel ist es, - * moeglichts viel im Puffer zu haben und _nicht_ gleich alles auf den - * Socket zu schreiben (u.a. wg. Komprimierung). */ - if( array_bytes(&My_Connections[Idx].wbuf) >= WRITEBUFFER_LEN) { - /* Der Puffer ist dummerweise voll. Jetzt versuchen, den Puffer - * zu schreiben, wenn das nicht klappt, haben wir ein Problem ... */ - if( ! Handle_Write( Idx )) return false; + /* Servers do get special write buffer limits, so they can generate + * all the messages that are required while peering. */ + if (Client_Type(c) == CLIENT_SERVER) + writebuf_limit = WRITEBUFFER_SLINK_LEN; - /* check again: if our writebuf is twice als large as the initial limit: Kill connection */ - if( array_bytes(&My_Connections[Idx].wbuf) >= (WRITEBUFFER_LEN*2)) { - Log( LOG_NOTICE, "Write buffer overflow (connection %d)!", Idx ); - Conn_Close( Idx, "Write buffer overflow!", NULL, false ); - return false; - } + /* Is the socket still open? A previous call to Conn_Write() + * may have closed the connection due to a fatal error. + * In this case it is sufficient to return an error, as well. */ + if( My_Connections[Idx].sock <= NONE ) { + LogDebug("Skipped write on closed socket (connection %d).", Idx); + return false; } #ifdef ZLIB if ( Conn_OPTION_ISSET( &My_Connections[Idx], CONN_ZIP )) { - /* Daten komprimieren und in Puffer kopieren */ - if( ! Zip_Buffer( Idx, Data, Len )) return false; + /* Compressed link: + * Zip_Buffer() does all the dirty work for us: it flushes + * the (pre-)compression buffers if required and handles + * all error conditions. */ + if (!Zip_Buffer(Idx, Data, Len)) + return false; } else #endif { - /* Daten in Puffer kopieren */ - if (!array_catb( &My_Connections[Idx].wbuf, Data, Len )) + /* Uncompressed link: + * Check if outbound buffer has enough space for the data. */ + if (array_bytes(&My_Connections[Idx].wbuf) + Len >= + writebuf_limit) { + /* Buffer is full, flush it. Handle_Write deals with + * low-level errors, if any. */ + if (!Handle_Write(Idx)) + return false; + } + + /* When the write buffer is still too big after flushing it, + * the connection will be killed. */ + if (array_bytes(&My_Connections[Idx].wbuf) + Len >= + writebuf_limit) { + Log(LOG_NOTICE, + "Write buffer overflow (connection %d, size %lu byte)!", + Idx, + (unsigned long)array_bytes(&My_Connections[Idx].wbuf)); + Conn_Close(Idx, "Write buffer overflow!", NULL, false); + return false; + } + + /* Copy data to write buffer */ + if (!array_catb(&My_Connections[Idx].wbuf, Data, Len)) return false; My_Connections[Idx].bytes_out += Len; @@ -681,6 +742,7 @@ Conn_Close( CONN_ID Idx, char *LogMsg, char *FwdMsg, bool InformClient ) CLIENT *c; char *txt; double in_k, out_k; + UINT16 port; #ifdef ZLIB double in_z_k, out_z_k; int in_p, out_p; @@ -700,12 +762,17 @@ Conn_Close( CONN_ID Idx, char *LogMsg, char *FwdMsg, bool InformClient ) /* Mark link as "closing" */ Conn_OPTION_ADD( &My_Connections[Idx], CONN_ISCLOSING ); - - if( LogMsg ) txt = LogMsg; - else txt = FwdMsg; - if( ! txt ) txt = "Reason unknown"; - Log( LOG_INFO, "Shutting down connection %d (%s) with %s:%d ...", Idx, LogMsg ? LogMsg : FwdMsg, My_Connections[Idx].host, ntohs( My_Connections[Idx].addr.sin_port )); + if (LogMsg) + txt = LogMsg; + else + txt = FwdMsg; + if (! txt) + txt = "Reason unknown"; + + port = ng_ipaddr_getport(&My_Connections[Idx].addr); + Log(LOG_INFO, "Shutting down connection %d (%s) with %s:%d ...", Idx, + LogMsg ? LogMsg : FwdMsg, My_Connections[Idx].host, port); /* Search client, if any */ c = Conn_GetClient( Idx ); @@ -723,7 +790,6 @@ Conn_Close( CONN_ID Idx, char *LogMsg, char *FwdMsg, bool InformClient ) (double)My_Connections[Idx].bytes_out / 1024); } #endif - /* Send ERROR to client (see RFC!) */ if (FwdMsg) Conn_WriteStr(Idx, "ERROR :%s", FwdMsg); @@ -741,39 +807,55 @@ Conn_Close( CONN_ID Idx, char *LogMsg, char *FwdMsg, bool InformClient ) c = Conn_GetClient( Idx ); /* Shut down socket */ - if( ! io_close( My_Connections[Idx].sock )) - { + if (! io_close(My_Connections[Idx].sock)) { /* Oops, we can't close the socket!? This is ... ugly! */ - Log( LOG_CRIT, "Error closing connection %d (socket %d) with %s:%d - %s! (ignored)", Idx, My_Connections[Idx].sock, My_Connections[Idx].host, ntohs( My_Connections[Idx].addr.sin_port), strerror( errno )); + Log(LOG_CRIT, + "Error closing connection %d (socket %d) with %s:%d - %s! (ignored)", + Idx, My_Connections[Idx].sock, My_Connections[Idx].host, + port, strerror(errno)); } /* Mark socket as invalid: */ My_Connections[Idx].sock = NONE; /* If there is still a client, unregister it now */ - if( c ) Client_Destroy( c, LogMsg, FwdMsg, true ); + if (c) + Client_Destroy(c, LogMsg, FwdMsg, true); /* Calculate statistics and log information */ in_k = (double)My_Connections[Idx].bytes_in / 1024; out_k = (double)My_Connections[Idx].bytes_out / 1024; #ifdef ZLIB - if ( Conn_OPTION_ISSET( &My_Connections[Idx], CONN_ZIP )) { + if (Conn_OPTION_ISSET( &My_Connections[Idx], CONN_ZIP)) { in_z_k = (double)My_Connections[Idx].zip.bytes_in / 1024; out_z_k = (double)My_Connections[Idx].zip.bytes_out / 1024; + /* Make sure that no division by zero can occur during + * the calculation of in_p and out_p: in_z_k and out_z_k + * are non-zero, that's guaranteed by the protocol until + * compression can be enabled. */ + if (! in_z_k) + in_z_k = in_k; + if (! out_z_k) + out_z_k = out_k; in_p = (int)(( in_k * 100 ) / in_z_k ); out_p = (int)(( out_k * 100 ) / out_z_k ); - Log( LOG_INFO, "Connection %d with %s:%d closed (in: %.1fk/%.1fk/%d%%, out: %.1fk/%.1fk/%d%%).", Idx, My_Connections[Idx].host, ntohs( My_Connections[Idx].addr.sin_port ), in_k, in_z_k, in_p, out_k, out_z_k, out_p ); + Log(LOG_INFO, + "Connection %d with %s:%d closed (in: %.1fk/%.1fk/%d%%, out: %.1fk/%.1fk/%d%%).", + Idx, My_Connections[Idx].host, port, + in_k, in_z_k, in_p, out_k, out_z_k, out_p); } else #endif { - Log( LOG_INFO, "Connection %d with %s:%d closed (in: %.1fk, out: %.1fk).", Idx, My_Connections[Idx].host, ntohs( My_Connections[Idx].addr.sin_port ), in_k, out_k ); + Log(LOG_INFO, + "Connection %d with %s:%d closed (in: %.1fk, out: %.1fk).", + Idx, My_Connections[Idx].host, port, + in_k, out_k); } /* cancel running resolver */ - if (Resolve_INPROGRESS(&My_Connections[Idx].res_stat)) { + if (Resolve_INPROGRESS(&My_Connections[Idx].res_stat)) Resolve_Shutdown(&My_Connections[Idx].res_stat); - } /* Servers: Modify time of next connect attempt? */ Conf_UnsetServer( Idx ); @@ -790,6 +872,7 @@ Conn_Close( CONN_ID Idx, char *LogMsg, char *FwdMsg, bool InformClient ) array_free(&My_Connections[Idx].rbuf); array_free(&My_Connections[Idx].wbuf); + /* Clean up connection structure (=free it) */ Init_Conn_Struct( Idx ); @@ -845,28 +928,29 @@ Handle_Write( CONN_ID Idx ) } assert( My_Connections[Idx].sock > NONE ); - LogDebug("Handle_Write() called for connection %d ...", Idx); - wdatalen = array_bytes(&My_Connections[Idx].wbuf ); + #ifdef ZLIB - if (wdatalen == 0 && !array_bytes(&My_Connections[Idx].zip.wbuf)) { - io_event_del(My_Connections[Idx].sock, IO_WANTWRITE ); - return true; + if (wdatalen == 0) { + /* Write buffer is empty, so we try to flush the compression + * buffer and get some data to work with from there :-) */ + if (!Zip_Flush(Idx)) + return false; + + /* Now the write buffer most probably has changed: */ + wdatalen = array_bytes(&My_Connections[Idx].wbuf); } +#endif - /* write buffer empty, but not compression buffer? - * -> flush compression buffer! */ - if (wdatalen == 0) - Zip_Flush(Idx); -#else if (wdatalen == 0) { + /* Still no data, fine. */ io_event_del(My_Connections[Idx].sock, IO_WANTWRITE ); return true; } -#endif - /* Zip_Flush() may have changed the write buffer ... */ - wdatalen = array_bytes(&My_Connections[Idx].wbuf); + LogDebug + ("Handle_Write() called for connection %d, %ld bytes pending ...", + Idx, wdatalen); len = write(My_Connections[Idx].sock, array_start(&My_Connections[Idx].wbuf), wdatalen ); @@ -888,6 +972,22 @@ Handle_Write( CONN_ID Idx ) } /* Handle_Write */ +static int +Count_Connections(ng_ipaddr_t *a) +{ + int i, cnt; + + cnt = 0; + for (i = 0; i < Pool_Size; i++) { + if (My_Connections[i].sock <= NONE) + continue; + if (ng_ipaddr_ipequal(&My_Connections[i].addr, a)) + cnt++; + } + return cnt; +} /* Count_Connections */ + + static int New_Connection( int Sock ) { @@ -897,14 +997,16 @@ New_Connection( int Sock ) #ifdef TCPWRAP struct request_info req; #endif - struct sockaddr_in new_addr; + ng_ipaddr_t new_addr; + char ip_str[NG_INET_ADDRSTRLEN]; int new_sock, new_sock_len, new_Pool_Size; CLIENT *c; long cnt; assert( Sock > NONE ); /* Connection auf Listen-Socket annehmen */ - new_sock_len = (int)sizeof new_addr; + new_sock_len = (int)sizeof(new_addr); + new_sock = accept(Sock, (struct sockaddr *)&new_addr, (socklen_t *)&new_sock_len); if (new_sock < 0) { @@ -912,14 +1014,18 @@ New_Connection( int Sock ) return -1; } + if (!ng_ipaddr_tostr_r(&new_addr, ip_str)) { + Log(LOG_CRIT, "fd %d: Can't convert IP address!", new_sock); + Simple_Message(new_sock, "ERROR :Internal Server Error"); + close(new_sock); + } + #ifdef TCPWRAP /* Validate socket using TCP Wrappers */ request_init( &req, RQ_DAEMON, PACKAGE_NAME, RQ_FILE, new_sock, RQ_CLIENT_SIN, &new_addr, NULL ); fromhost(&req); - if( ! hosts_access( &req )) - { - /* Access denied! */ - Log( deny_severity, "Refused connection from %s (by TCP Wrappers)!", inet_ntoa( new_addr.sin_addr )); + if (!hosts_access(&req)) { + Log (deny_severity, "Refused connection from %s (by TCP Wrappers)!", ip_str); Simple_Message( new_sock, "ERROR :Connection refused" ); close( new_sock ); return -1; @@ -929,13 +1035,12 @@ New_Connection( int Sock ) /* Socket initialisieren */ if (!Init_Socket( new_sock )) return -1; - + /* Check IP-based connection limit */ - cnt = Count_Connections( new_addr ); - if(( Conf_MaxConnectionsIP > 0 ) && ( cnt >= Conf_MaxConnectionsIP )) - { + cnt = Count_Connections(&new_addr); + if ((Conf_MaxConnectionsIP > 0) && (cnt >= Conf_MaxConnectionsIP)) { /* Access denied, too many connections from this IP address! */ - Log( LOG_ERR, "Refused connection from %s: too may connections (%ld) from this IP address!", inet_ntoa( new_addr.sin_addr ), cnt); + Log( LOG_ERR, "Refused connection from %s: too may connections (%ld) from this IP address!", ip_str, cnt); Simple_Message( new_sock, "ERROR :Connection refused, too many connections from your IP address!" ); close( new_sock ); return -1; @@ -969,11 +1074,19 @@ New_Connection( int Sock ) Init_Conn_Struct(Pool_Size++); } - c = Client_NewLocal( new_sock, inet_ntoa( new_addr.sin_addr ), CLIENT_UNKNOWN, false ); + /* register callback */ + if (!io_event_create( new_sock, IO_WANTREAD, cb_clientserver)) { + Log(LOG_ALERT, "Can't accept connection: io_event_create failed!"); + Simple_Message(new_sock, "ERROR :Internal error"); + close(new_sock); + return -1; + } + + c = Client_NewLocal(new_sock, ip_str, CLIENT_UNKNOWN, false ); if( ! c ) { - Log( LOG_ALERT, "Can't accept connection: can't create client structure!" ); - Simple_Message( new_sock, "ERROR :Internal error" ); - close( new_sock ); + Log(LOG_ALERT, "Can't accept connection: can't create client structure!"); + Simple_Message(new_sock, "ERROR :Internal error"); + io_close(new_sock); return -1; } @@ -982,27 +1095,19 @@ New_Connection( int Sock ) My_Connections[new_sock].addr = new_addr; My_Connections[new_sock].client = c; - /* register callback */ - if (!io_event_create( new_sock, IO_WANTREAD, cb_clientserver)) { - Simple_Message( new_sock, "ERROR :Internal error" ); - Conn_Close( new_sock, "io_event_create() failed", NULL, false ); - return -1; - } - Log( LOG_INFO, "Accepted connection %d from %s:%d on socket %d.", new_sock, - inet_ntoa( new_addr.sin_addr ), ntohs( new_addr.sin_port), Sock ); + ip_str, ng_ipaddr_getport(&new_addr), Sock); /* Hostnamen ermitteln */ - strlcpy( My_Connections[new_sock].host, inet_ntoa( new_addr.sin_addr ), - sizeof( My_Connections[new_sock].host )); + strlcpy(My_Connections[new_sock].host, ip_str, sizeof(My_Connections[new_sock].host)); - Client_SetHostname( c, My_Connections[new_sock].host ); + Client_SetHostname(c, My_Connections[new_sock].host); - Resolve_Addr(&My_Connections[new_sock].res_stat, &new_addr, - My_Connections[new_sock].sock, cb_Read_Resolver_Result); + if (!Conf_NoDNS) + Resolve_Addr(&My_Connections[new_sock].res_stat, &new_addr, + My_Connections[new_sock].sock, cb_Read_Resolver_Result); - /* Penalty-Zeit setzen */ - Conn_SetPenalty( new_sock, 4 ); + Conn_SetPenalty(new_sock, 4); return new_sock; } /* New_Connection */ @@ -1024,47 +1129,52 @@ Socket2Index( int Sock ) } /* Socket2Index */ +/** + * Read data from the network to the read buffer. If an error occures, + * the socket of this connection will be shut down. + */ static void Read_Request( CONN_ID Idx ) { - /* Daten von Socket einlesen und entsprechend behandeln. - * Tritt ein Fehler auf, so wird der Socket geschlossen. */ - ssize_t len; - char readbuf[1024]; + char readbuf[READBUFFER_LEN]; CLIENT *c; - assert( Idx > NONE ); assert( My_Connections[Idx].sock > NONE ); #ifdef ZLIB - if (( array_bytes(&My_Connections[Idx].rbuf) >= READBUFFER_LEN ) || - ( array_bytes(&My_Connections[Idx].zip.rbuf) >= ZREADBUFFER_LEN )) + if ((array_bytes(&My_Connections[Idx].rbuf) >= READBUFFER_LEN) || + (array_bytes(&My_Connections[Idx].zip.rbuf) >= READBUFFER_LEN)) #else - if ( array_bytes(&My_Connections[Idx].rbuf) >= READBUFFER_LEN ) + if (array_bytes(&My_Connections[Idx].rbuf) >= READBUFFER_LEN) #endif { - /* Der Lesepuffer ist voll */ - Log( LOG_ERR, "Receive buffer overflow (connection %d): %d bytes!", Idx, - array_bytes(&My_Connections[Idx].rbuf)); + /* Read buffer is full */ + Log(LOG_ERR, + "Receive buffer overflow (connection %d): %d bytes!", + Idx, array_bytes(&My_Connections[Idx].rbuf)); Conn_Close( Idx, "Receive buffer overflow!", NULL, false ); return; } - len = read( My_Connections[Idx].sock, readbuf, sizeof readbuf -1 ); - if( len == 0 ) { - Log( LOG_INFO, "%s:%d (%s) is closing the connection ...", - My_Connections[Idx].host, ntohs( My_Connections[Idx].addr.sin_port), - inet_ntoa( My_Connections[Idx].addr.sin_addr )); - Conn_Close( Idx, "Socket closed!", "Client closed connection", false ); + len = read(My_Connections[Idx].sock, readbuf, sizeof(readbuf)); + if (len == 0) { + Log(LOG_INFO, "%s:%u (%s) is closing the connection ...", + My_Connections[Idx].host, + (unsigned int) ng_ipaddr_getport(&My_Connections[Idx].addr), + ng_ipaddr_tostr(&My_Connections[Idx].addr)); + Conn_Close(Idx, + "Socket closed!", "Client closed connection", + false); return; } - if( len < 0 ) { + if (len < 0) { if( errno == EAGAIN ) return; - Log( LOG_ERR, "Read error on connection %d (socket %d): %s!", Idx, - My_Connections[Idx].sock, strerror( errno )); - Conn_Close( Idx, "Read error!", "Client closed connection", false ); + Log(LOG_ERR, "Read error on connection %d (socket %d): %s!", + Idx, My_Connections[Idx].sock, strerror(errno)); + Conn_Close(Idx, "Read error!", "Client closed connection", + false); return; } #ifdef ZLIB @@ -1081,8 +1191,7 @@ Read_Request( CONN_ID Idx ) } else #endif { - readbuf[len] = 0; - if (!array_cats( &My_Connections[Idx].rbuf, readbuf )) { + if (!array_catb( &My_Connections[Idx].rbuf, readbuf, len)) { Log( LOG_ERR, "Could not append recieved data to input buffer (connn %d): %d bytes!", Idx, len ); Conn_Close( Idx, "Receive buffer overflow!", NULL, false ); } @@ -1201,11 +1310,6 @@ Handle_Buffer( CONN_ID Idx ) /* The last Command activated Socket-Compression. * Data that was read after that needs to be copied to Unzip-buf * for decompression */ - if( array_bytes(&My_Connections[Idx].rbuf)> ZREADBUFFER_LEN ) { - Log( LOG_ALERT, "Connection %d: No space left in unzip buf (need %u bytes)!", - Idx, array_bytes(&My_Connections[Idx].rbuf )); - return false; - } if (!array_copy( &My_Connections[Idx].zip.rbuf, &My_Connections[Idx].rbuf )) return false; @@ -1293,7 +1397,7 @@ Check_Servers( void ) if( Conf_Server[i].group > NONE ) { for (n = 0; n < MAX_SERVERS; n++) { if (n == i) continue; - if ((Conf_Server[n].conn_id > NONE) && + if ((Conf_Server[n].conn_id != NONE) && (Conf_Server[n].group == Conf_Server[i].group)) break; } @@ -1307,6 +1411,7 @@ Check_Servers( void ) /* Okay, try to connect now */ Conf_Server[i].lasttry = time_now; + Conf_Server[i].conn_id = SERVER_WAIT; assert(Resolve_Getfd(&Conf_Server[i].res_stat) < 0); Resolve_Name(&Conf_Server[i].res_stat, Conf_Server[i].host, cb_Connect_to_Server); } @@ -1314,54 +1419,50 @@ Check_Servers( void ) static void -New_Server( int Server ) +New_Server( int Server , ng_ipaddr_t *dest) { /* Establish new server link */ - - struct sockaddr_in new_addr; - struct in_addr inaddr; - int res, new_sock; + char ip_str[NG_INET_ADDRSTRLEN]; + int af_dest, res, new_sock; CLIENT *c; assert( Server > NONE ); - Log( LOG_INFO, "Establishing connection to \"%s\", %s, port %d ... ", Conf_Server[Server].host, - Conf_Server[Server].ip, Conf_Server[Server].port ); - -#ifdef HAVE_INET_ATON - if( inet_aton( Conf_Server[Server].ip, &inaddr ) == 0 ) -#else - memset( &inaddr, 0, sizeof( inaddr )); - inaddr.s_addr = inet_addr( Conf_Server[Server].ip ); - if( inaddr.s_addr == (unsigned)-1 ) -#endif - { - Log( LOG_ERR, "Can't connect to \"%s\": can't convert ip address %s!", - Conf_Server[Server].host, Conf_Server[Server].ip ); + if (!ng_ipaddr_tostr_r(dest, ip_str)) { + Log(LOG_WARNING, "New_Server: Could not convert IP to string"); return; } - memset( &new_addr, 0, sizeof( new_addr )); - new_addr.sin_family = (sa_family_t)AF_INET; - new_addr.sin_addr = inaddr; - new_addr.sin_port = htons( Conf_Server[Server].port ); + Log( LOG_INFO, "Establishing connection to \"%s\", %s, port %d ... ", + Conf_Server[Server].host, ip_str, Conf_Server[Server].port ); - new_sock = socket( PF_INET, SOCK_STREAM, 0 ); - if ( new_sock < 0 ) { + af_dest = ng_ipaddr_af(dest); + new_sock = socket(af_dest, SOCK_STREAM, 0); + if (new_sock < 0) { Log( LOG_CRIT, "Can't create socket: %s!", strerror( errno )); return; } - if( ! Init_Socket( new_sock )) return; + if (!Init_Socket(new_sock)) + return; - res = connect(new_sock, (struct sockaddr *)&new_addr, - (socklen_t)sizeof(new_addr)); + /* is a bind address configured? */ + res = ng_ipaddr_af(&Conf_Server[Server].bind_addr); + /* if yes, bind now. If it fails, warn and let connect() pick a source address */ + if (res && bind(new_sock, (struct sockaddr *) &Conf_Server[Server].bind_addr, + ng_ipaddr_salen(&Conf_Server[Server].bind_addr))) + { + ng_ipaddr_tostr_r(&Conf_Server[Server].bind_addr, ip_str); + Log(LOG_WARNING, "Can't bind socket to %s: %s!", ip_str, strerror(errno)); + } + ng_ipaddr_setport(dest, Conf_Server[Server].port); + res = connect(new_sock, (struct sockaddr *) dest, ng_ipaddr_salen(dest)); if(( res != 0 ) && ( errno != EINPROGRESS )) { Log( LOG_CRIT, "Can't connect socket: %s!", strerror( errno )); close( new_sock ); return; } - + if (!array_alloc(&My_ConnArray, sizeof(CONNECTION), (size_t)new_sock)) { Log(LOG_ALERT, "Cannot allocate memory for server connection (socket %d)", @@ -1376,8 +1477,9 @@ New_Server( int Server ) Init_Conn_Struct(new_sock); - c = Client_NewLocal( new_sock, inet_ntoa( new_addr.sin_addr ), CLIENT_UNKNOWNSERVER, false ); - if( ! c ) { + ng_ipaddr_tostr_r(dest, ip_str); + c = Client_NewLocal(new_sock, ip_str, CLIENT_UNKNOWNSERVER, false); + if (!c) { Log( LOG_ALERT, "Can't establish connection: can't create client structure!" ); close( new_sock ); return; @@ -1389,7 +1491,7 @@ New_Server( int Server ) /* Register connection */ Conf_Server[Server].conn_id = new_sock; My_Connections[new_sock].sock = new_sock; - My_Connections[new_sock].addr = new_addr; + My_Connections[new_sock].addr = *dest; My_Connections[new_sock].client = c; strlcpy( My_Connections[new_sock].host, Conf_Server[Server].host, sizeof(My_Connections[new_sock].host )); @@ -1408,14 +1510,17 @@ New_Server( int Server ) } /* New_Server */ +/** + * Initialize connection structure. + */ static void -Init_Conn_Struct( CONN_ID Idx ) +Init_Conn_Struct(CONN_ID Idx) { - time_t now = time( NULL ); - /* Connection-Struktur initialisieren */ + time_t now = time(NULL); - memset( &My_Connections[Idx], 0, sizeof ( CONNECTION )); + memset(&My_Connections[Idx], 0, sizeof(CONNECTION)); My_Connections[Idx].sock = -1; + My_Connections[Idx].signon = now; My_Connections[Idx].lastdata = now; My_Connections[Idx].lastprivmsg = now; Resolve_Init(&My_Connections[Idx].res_stat); @@ -1465,7 +1570,9 @@ cb_Connect_to_Server(int fd, UNUSED short events) /* Read result of resolver sub-process from pipe and start connection */ int i; size_t len; - char readbuf[HOST_LEN + 1]; + ng_ipaddr_t dest_addrs[4]; /* we can handle at most 3; but we read up to + four so we can log the 'more than we can handle' + condition */ LogDebug("Resolver: Got forward lookup callback on fd %d, events %d", fd, events); @@ -1473,7 +1580,7 @@ cb_Connect_to_Server(int fd, UNUSED short events) if (Resolve_Getfd(&Conf_Server[i].res_stat) == fd ) break; } - + if( i >= MAX_SERVERS) { /* Ops, no matching server found?! */ io_close( fd ); @@ -1482,16 +1589,28 @@ cb_Connect_to_Server(int fd, UNUSED short events) } /* Read result from pipe */ - len = Resolve_Read(&Conf_Server[i].res_stat, readbuf, sizeof readbuf -1); + len = Resolve_Read(&Conf_Server[i].res_stat, dest_addrs, sizeof(dest_addrs)); if (len == 0) return; - - readbuf[len] = '\0'; - LogDebug("Got result from resolver: \"%s\" (%u bytes read).", readbuf, len); - strlcpy( Conf_Server[i].ip, readbuf, sizeof( Conf_Server[i].ip )); + assert((len % sizeof(ng_ipaddr_t)) == 0); + + LogDebug("Got result from resolver: %u structs (%u bytes).", len/sizeof(ng_ipaddr_t), len); + + memset(&Conf_Server[i].dst_addr, 0, sizeof(&Conf_Server[i].dst_addr)); + if (len > sizeof(ng_ipaddr_t)) { + /* more than one address for this hostname, remember them + * in case first address is unreachable/not available */ + len -= sizeof(ng_ipaddr_t); + if (len > sizeof(&Conf_Server[i].dst_addr)) { + len = sizeof(&Conf_Server[i].dst_addr); + Log(LOG_NOTICE, "Notice: Resolver returned more IP Addresses for host than we can handle," + " additional addresses dropped"); + } + memcpy(&Conf_Server[i].dst_addr, &dest_addrs[1], len); + } /* connect() */ - New_Server(i); + New_Server(i, dest_addrs); } /* cb_Read_Forward_Lookup */ @@ -1558,10 +1677,10 @@ cb_Read_Resolver_Result( int r_fd, UNUSED short events ) #ifdef IDENTAUTH ++identptr; if (*identptr) { - Log( LOG_INFO, "IDENT lookup for connection %ld: \"%s\".", i, identptr); - Client_SetUser( c, identptr, true ); + Log(LOG_INFO, "IDENT lookup for connection %d: \"%s\".", i, identptr); + Client_SetUser(c, identptr, true); } else { - Log( LOG_INFO, "IDENT lookup for connection %ld: no result.", i ); + Log(LOG_INFO, "IDENT lookup for connection %d: no result.", i); } #endif } @@ -1590,19 +1709,6 @@ Simple_Message( int Sock, const char *Msg ) } /* Simple_Error */ -static int -Count_Connections( struct sockaddr_in addr_in ) -{ - int i, cnt; - - cnt = 0; - for( i = 0; i < Pool_Size; i++ ) { - if(( My_Connections[i].sock > NONE ) && ( My_Connections[i].addr.sin_addr.s_addr == addr_in.sin_addr.s_addr )) cnt++; - } - return cnt; -} /* Count_Connections */ - - GLOBAL CLIENT * Conn_GetClient( CONN_ID Idx ) { @@ -1613,9 +1719,9 @@ Conn_GetClient( CONN_ID Idx ) assert( Idx >= 0 ); c = array_get(&My_ConnArray, sizeof (CONNECTION), (size_t)Idx); - + assert(c != NULL); - + return c ? c->client : NULL; }