X-Git-Url: https://arthur.barton.de/cgi-bin/gitweb.cgi?p=ngircd-alex.git;a=blobdiff_plain;f=src%2Fngircd%2Fconn.c;h=2d5e1295f4341b1675db274f0263f66fda92b3f8;hp=0c3f4fcee70f705a4a5acff9c92238d682336689;hb=ffad2da835e26a1a457d4f4a16acf6797d4cc71e;hpb=bc09a3e4876bd92b1c5c8706203ce85c54e180d6 diff --git a/src/ngircd/conn.c b/src/ngircd/conn.c index 0c3f4fce..62561544 100644 --- a/src/ngircd/conn.c +++ b/src/ngircd/conn.c @@ -1,102 +1,102 @@ /* * ngIRCd -- The Next Generation IRC Daemon - * Copyright (c)2001-2005 Alexander Barton + * Copyright (c)2001-2014 Alexander Barton (alex@barton.de) and Contributors. * * 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 * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * Please read the file COPYING, README and AUTHORS for more information. - * - * Connection management */ - #define CONN_MODULE #include "portab.h" -#include "io.h" -static char UNUSED id[] = "$Id: conn.c,v 1.184 2005/10/11 19:29:23 alex Exp $"; +/** + * @file + * Connection management + */ + +/* Additionan debug messages related to buffer handling: 0=off / 1=on */ +#define DEBUG_BUFFER 0 -#include "imp.h" #include #ifdef PROTOTYPES -# include +# include #else -# include +# include #endif #include #include #include #include #include +#include #include -#include +#include #include #include #include #ifdef HAVE_NETINET_IP_H +# ifdef HAVE_NETINET_IN_SYSTM_H +# include +# endif # 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 - #ifdef TCPWRAP # include /* for TCP Wrappers */ #endif -#include "array.h" -#include "defines.h" -#include "resolve.h" - -#include "exp.h" #include "conn.h" -#include "imp.h" #include "ngircd.h" -#include "client.h" -#include "conf.h" +#include "class.h" +#ifdef ICONV +# include "conn-encoding.h" +#endif +#include "conn-ssl.h" #include "conn-zip.h" #include "conn-func.h" +#include "io.h" #include "log.h" +#include "ng_ipaddr.h" #include "parse.h" -#include "tool.h" - -#ifdef ZEROCONF -# include "rendezvous.h" -#endif +#include "resolve.h" -#include "exp.h" +#define SERVER_WAIT (NONE - 1) /** "Wait for outgoing connection" flag */ +#define MAX_COMMANDS 3 /** Max. commands per loop for users */ +#define MAX_COMMANDS_SERVER_MIN 10 /** Min. commands per loop for servers */ +#define MAX_COMMANDS_SERVICE 10 /** Max. commands per loop for services */ -#define SERVER_WAIT (NONE - 1) +#define SD_LISTEN_FDS_START 3 /** systemd(8) socket activation offset */ +#define THROTTLE_CMDS 1 /** Throttling: max commands reached */ +#define THROTTLE_BPS 2 /** Throttling: max bps reached */ static bool Handle_Write PARAMS(( CONN_ID Idx )); -static int New_Connection PARAMS(( int Sock )); +static bool Conn_Write PARAMS(( CONN_ID Idx, char *Data, size_t Len )); +static int New_Connection PARAMS(( int Sock, bool IsSSL )); static CONN_ID Socket2Index PARAMS(( int Sock )); static void Read_Request PARAMS(( CONN_ID Idx )); -static bool Handle_Buffer PARAMS(( CONN_ID Idx )); +static unsigned int Handle_Buffer PARAMS(( CONN_ID Idx )); 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, CONN_ID Idx )); -static void Simple_Message PARAMS(( int Sock, char *Msg )); -static int Count_Connections PARAMS(( struct sockaddr_in addr )); -static int NewListener PARAMS(( const UINT16 Port )); +static void New_Server PARAMS(( int Server, ng_ipaddr_t *dest )); +static void Simple_Message PARAMS(( int Sock, const char *Msg )); +static int NewListener PARAMS(( const char *listen_addr, UINT16 Port )); +static void Account_Connection PARAMS((void)); +static void Throttle_Connection PARAMS((const CONN_ID Idx, CLIENT *Client, + const int Reason, unsigned int Value)); static array My_Listeners; +static array My_ConnArray; +static size_t NumConnections, NumConnectionsMax, NumConnectionsAccepted; #ifdef TCPWRAP int allow_severity = LOG_INFO; @@ -105,38 +105,105 @@ int deny_severity = LOG_ERR; static void server_login PARAMS((CONN_ID idx)); -static void cb_Read_Resolver_Result PARAMS(( int sock, UNUSED short what)); +#ifdef SSL_SUPPORT +extern struct SSLOptions Conf_SSLOptions; +static bool SSL_WantRead PARAMS((const CONNECTION *c)); +static bool SSL_WantWrite PARAMS((const CONNECTION *c)); +static void cb_listen_ssl PARAMS((int sock, short irrelevant)); +static void cb_connserver_login_ssl PARAMS((int sock, short what)); +static void cb_clientserver_ssl PARAMS((int sock, short what)); +#endif +static void cb_Read_Resolver_Result PARAMS((int sock, UNUSED short what)); +static void cb_Connect_to_Server PARAMS((int sock, UNUSED short what)); static void cb_clientserver PARAMS((int sock, short what)); +time_t idle_t = 0; + +/** + * Get number of sockets available from systemd(8). + * + * ngIRCd needs to implement its own sd_listen_fds(3) function and can't + * use the one provided by systemd itself, because the sockets will be + * used in a forked child process with a new PID, and this would trigger + * an error in the standard implementation. + * + * @return Number of sockets available, -1 if sockets have already been + * initialized, or 0 when no sockets have been passed. + */ +static int +my_sd_listen_fds(void) +{ + const char *e; + int count; + + /* Check if LISTEN_PID exists; but we ignore the result, because + * normally ngircd forks a child before checking this, and therefore + * the PID set in the environment is always wrong ... */ + e = getenv("LISTEN_PID"); + if (!e || !*e) + return 0; + + e = getenv("LISTEN_FDS"); + if (!e || !*e) + return -1; + count = atoi(e); +#ifdef HAVE_UNSETENV + unsetenv("LISTEN_FDS"); +#endif + + return count; +} + +/** + * IO callback for listening sockets: handle new connections. This callback + * gets called when a new non-SSL connection should be accepted. + * + * @param sock Socket descriptor. + * @param irrelevant (ignored IO specification) + */ static void cb_listen(int sock, short irrelevant) { (void) irrelevant; - New_Connection( sock ); + (void) New_Connection(sock, false); } - +/** + * IO callback for new outgoing non-SSL server connections. + * + * @param sock Socket descriptor. + * @param what IO specification (IO_WANTREAD/IO_WANTWRITE/...). + */ static void cb_connserver(int sock, UNUSED short what) { - int res, err; + int res, err, server; socklen_t sock_len; - CLIENT *c; CONN_ID idx = Socket2Index( sock ); + if (idx <= NONE) { -#ifdef DEBUG - Log(LOG_DEBUG, "cb_connserver wants to write on unknown socket?!"); -#endif + LogDebug("cb_connserver wants to write on unknown socket?!"); io_close(sock); return; } - assert( what & IO_WANTWRITE); + assert(what & IO_WANTWRITE); + + /* Make sure that the server is still configured; it could have been + * removed in the meantime! */ + server = Conf_GetServer(idx); + if (server < 0) { + Log(LOG_ERR, "Connection on socket %d to \"%s\" aborted!", + sock, My_Connections[idx].host); + Conn_Close(idx, "Connection aborted", NULL, false); + return; + } /* connect() finished, get result. */ - sock_len = sizeof( err ); - res = getsockopt( My_Connections[idx].sock, SOL_SOCKET, SO_ERROR, &err, &sock_len ); - assert( sock_len == sizeof( err )); + sock_len = (socklen_t)sizeof(err); + res = getsockopt(My_Connections[idx].sock, SOL_SOCKET, SO_ERROR, + &err, &sock_len ); + assert(sock_len == sizeof(err)); /* Error while connecting? */ if ((res != 0) || (err != 0)) { @@ -146,150 +213,197 @@ cb_connserver(int sock, UNUSED short what) else Log(LOG_CRIT, "Can't connect socket to \"%s:%d\" (connection %d): %s!", - My_Connections[idx].host, - Conf_Server[Conf_GetServer(idx)].port, + My_Connections[idx].host, Conf_Server[server].port, idx, strerror(err)); - /* Clean up the CLIENT structure (to avoid silly log - * messages) and call Conn_Close() to do the rest. */ - c = Client_GetFromConn(idx); - if (c) - Client_DestroyNow(c); - - Conn_Close(idx, "Can't connect!", NULL, false); - - /* Set the timestamp of the last connect attempt */ - Conf_UnsetServer(idx); - + Conn_Close(idx, "Can't connect", NULL, false); + + if (ng_ipaddr_af(&Conf_Server[server].dst_addr[0])) { + /* more addresses to try... */ + New_Server(server, &Conf_Server[server].dst_addr[0]); + /* connection to dst_addr[0] is now in progress, so + * remove this address... */ + Conf_Server[server].dst_addr[0] = + Conf_Server[server].dst_addr[1]; + memset(&Conf_Server[server].dst_addr[1], 0, + sizeof(Conf_Server[server].dst_addr[1])); + } return; } + /* connect() succeeded, remove all additional addresses */ + memset(&Conf_Server[server].dst_addr, 0, + sizeof(Conf_Server[server].dst_addr)); + Conn_OPTION_DEL( &My_Connections[idx], CONN_ISCONNECTING ); +#ifdef SSL_SUPPORT + if ( Conn_OPTION_ISSET( &My_Connections[idx], CONN_SSL_CONNECT )) { + io_event_setcb( sock, cb_connserver_login_ssl ); + io_event_add( sock, IO_WANTWRITE|IO_WANTREAD ); + return; + } +#endif server_login(idx); } - +/** + * Login to a remote server. + * + * @param idx Connection index. + */ static void server_login(CONN_ID idx) { - Log( LOG_INFO, "Connection %d with \"%s:%d\" established. Now logging in ...", idx, - My_Connections[idx].host, Conf_Server[Conf_GetServer( idx )].port ); + Log(LOG_INFO, + "Connection %d (socket %d) with \"%s:%d\" established. Now logging in ...", + idx, My_Connections[idx].sock, My_Connections[idx].host, + Conf_Server[Conf_GetServer(idx)].port); io_event_setcb( My_Connections[idx].sock, cb_clientserver); io_event_add( My_Connections[idx].sock, IO_WANTREAD|IO_WANTWRITE); /* Send PASS and SERVER command to peer */ - Conn_WriteStr( idx, "PASS %s %s", Conf_Server[Conf_GetServer( idx )].pwd_out, NGIRCd_ProtoID ); - Conn_WriteStr( idx, "SERVER %s :%s", Conf_ServerName, Conf_ServerInfo ); + Conn_WriteStr(idx, "PASS %s %s", + Conf_Server[Conf_GetServer( idx )].pwd_out, NGIRCd_ProtoID); + Conn_WriteStr(idx, "SERVER %s :%s", + Conf_ServerName, Conf_ServerInfo); } - +/** + * IO callback for established non-SSL client and server connections. + * + * @param sock Socket descriptor. + * @param what IO specification (IO_WANTREAD/IO_WANTWRITE/...). + */ static void cb_clientserver(int sock, short what) { - CONN_ID idx = Socket2Index( sock ); - if (idx <= NONE) { -#ifdef DEBUG - Log(LOG_WARNING, "WTF: cb_clientserver wants to write on unknown socket?!"); -#endif + CONN_ID idx = Socket2Index(sock); + + assert(idx >= 0); + + if (idx < 0) { io_close(sock); return; } - +#ifdef SSL_SUPPORT + if (what & IO_WANTREAD + || (Conn_OPTION_ISSET(&My_Connections[idx], CONN_SSL_WANT_WRITE))) { + /* if TLS layer needs to write additional data, call + * Read_Request() instead so that SSL/TLS can continue */ + Read_Request(idx); + } +#else if (what & IO_WANTREAD) - Read_Request( idx ); - + Read_Request(idx); +#endif if (what & IO_WANTWRITE) - Handle_Write( idx ); + Handle_Write(idx); } - +/** + * Initialize connection module. + */ GLOBAL void Conn_Init( void ) { - /* Modul initialisieren: statische Strukturen "ausnullen". */ - CONN_ID i; - /* Speicher fuer Verbindungs-Pool anfordern */ Pool_Size = CONNECTION_POOL; - if( Conf_MaxConnections > 0 ) - { - /* konfiguriertes Limit beachten */ - if( Pool_Size > Conf_MaxConnections ) Pool_Size = Conf_MaxConnections; - } - My_Connections = (CONNECTION *) calloc( Pool_Size, sizeof( CONNECTION ) ); - if( ! My_Connections ) - { - /* Speicher konnte nicht alloziert werden! */ - Log( LOG_EMERG, "Can't allocate memory! [Conn_Init]" ); - exit( 1 ); + if ((Conf_MaxConnections > 0) && + (Pool_Size > Conf_MaxConnections)) + Pool_Size = Conf_MaxConnections; + + if (!array_alloc(&My_ConnArray, sizeof(CONNECTION), (size_t)Pool_Size)) { + Log(LOG_EMERG, "Can't allocate memory! [Conn_Init]"); + exit(1); } -#ifdef DEBUG - Log( LOG_DEBUG, "Allocated connection pool for %d items (%ld bytes).", Pool_Size, sizeof( CONNECTION ) * Pool_Size ); -#endif - array_free( &My_Listeners ); + /* FIXME: My_Connetions/Pool_Size is needed by other parts of the + * code; remove them! */ + My_Connections = (CONNECTION*) array_start(&My_ConnArray); - /* Groesster File-Descriptor fuer select() */ - Conn_MaxFD = 0; + LogDebug("Allocated connection pool for %d items (%ld bytes).", + array_length(&My_ConnArray, sizeof(CONNECTION)), + array_bytes(&My_ConnArray)); - /* Connection-Struktur initialisieren */ - for( i = 0; i < Pool_Size; i++ ) Init_Conn_Struct( i ); + assert(array_length(&My_ConnArray, sizeof(CONNECTION)) >= (size_t)Pool_Size); + + array_free( &My_Listeners ); - /* Global write counter */ - WCounter = 0; + for (i = 0; i < Pool_Size; i++) + Init_Conn_Struct(i); } /* Conn_Init */ - +/** + * Clean up connection module. + */ GLOBAL void Conn_Exit( void ) { - /* Modul abmelden: alle noch offenen Connections - * schliessen und freigeben. */ - CONN_ID idx; -#ifdef DEBUG - Log( LOG_DEBUG, "Shutting down all connections ..." ); -#endif - Conn_ExitListeners(); - /* Sockets schliessen */ + LogDebug("Shutting down all connections ..." ); for( idx = 0; idx < Pool_Size; idx++ ) { if( My_Connections[idx].sock > NONE ) { Conn_Close( idx, NULL, NGIRCd_SignalRestart ? "Server going down (restarting)":"Server going down", true ); - continue; } } - free( My_Connections ); + array_free(&My_ConnArray); My_Connections = NULL; Pool_Size = 0; io_library_shutdown(); } /* Conn_Exit */ +/** + * Close all sockets (file descriptors) of open connections. + * This is useful in forked child processes, for example, to make sure that + * they don't hold connections open that the main process wants to close. + */ +GLOBAL void +Conn_CloseAllSockets(int ExceptOf) +{ + CONN_ID idx; + + for(idx = 0; idx < Pool_Size; idx++) { + if(My_Connections[idx].sock > NONE && + My_Connections[idx].sock != ExceptOf) + close(My_Connections[idx].sock); + } +} +/** + * Initialize listening ports. + * + * @param a Array containing the ports the daemon should listen on. + * @param listen_addr Address the socket should listen on (can be "0.0.0.0"). + * @param func IO callback function to register. + * @returns Number of listening sockets created. + */ static unsigned int -ports_initlisteners(array *a, void (*func)(int,short)) +Init_Listeners(array *a, const char *listen_addr, void (*func)(int,short)) { - unsigned int created = 0, len; + unsigned int created = 0; + size_t len; int fd; UINT16 *port; len = array_length(a, sizeof (UINT16)); port = array_start(a); - while(len--) { - fd = NewListener( *port ); + while (len--) { + fd = NewListener(listen_addr, *port); if (fd < 0) { port++; continue; } if (!io_event_create( fd, IO_WANTREAD, func )) { - Log( LOG_ERR, "io_event_create(): Could not add listening fd %d (port %u): %s!", - fd, (unsigned int) *port, strerror(errno)); + Log(LOG_ERR, + "io_event_create(): Can't add fd %d (port %u): %s!", + fd, (unsigned int) *port, strerror(errno)); close(fd); port++; continue; @@ -297,273 +411,406 @@ ports_initlisteners(array *a, void (*func)(int,short)) created++; port++; } - return created; } - -GLOBAL int +/** + * Initialize all listening sockets. + * + * @returns Number of created listening sockets + */ +GLOBAL unsigned int Conn_InitListeners( void ) { /* Initialize ports on which the server should accept connections */ + unsigned int created = 0; + char *af_str, *copy, *listen_addr; + int count, fd, i, addr_len; + ng_ipaddr_t addr; + + assert(Conf_ListenAddress); + + count = my_sd_listen_fds(); + if (count < 0) { + Log(LOG_INFO, + "Not re-initializing listening sockets of systemd(8) ..."); + return 0; + } + if (count > 0) { + /* systemd(8) passed sockets to us, so don't try to initialize + * listening sockets on our own but use the passed ones */ + LogDebug("Initializing %d systemd sockets ...", count); + for (i = 0; i < count; i++) { + fd = SD_LISTEN_FDS_START + i; + addr_len = (int)sizeof(addr); + getsockname(fd, (struct sockaddr *)&addr, + (socklen_t*)&addr_len); +#ifdef WANT_IPV6 + if (addr.sin4.sin_family != AF_INET + && addr.sin4.sin_family != AF_INET6) +#else + if (addr.sin4.sin_family != AF_INET) +#endif + { + /* Socket is of unsupported type! For example, + * systemd passed in an IPv6 socket but ngIRCd + * isn't compiled with IPv6 support. */ + switch (addr.sin4.sin_family) + { + case AF_UNSPEC: af_str = "AF_UNSPEC"; break; + case AF_UNIX: af_str = "AF_UNIX"; break; + case AF_INET: af_str = "AF_INET"; break; +#ifdef AF_INET6 + case AF_INET6: af_str = "AF_INET6"; break; +#endif +#ifdef AF_NETLINK + case AF_NETLINK: af_str = "AF_NETLINK"; break; +#endif + default: af_str = "unknown"; break; + } + Log(LOG_CRIT, + "Socket %d is of unsupported type \"%s\" (%d), have to ignore it!", + fd, af_str, addr.sin4.sin_family); + close(fd); + continue; + } + + Init_Socket(fd); + if (!io_event_create(fd, IO_WANTREAD, cb_listen)) { + Log(LOG_ERR, + "io_event_create(): Can't add fd %d: %s!", + fd, strerror(errno)); + continue; + } + Log(LOG_INFO, + "Initialized socket %d from systemd(8): %s:%d.", fd, + ng_ipaddr_tostr(&addr), ng_ipaddr_getport(&addr)); + created++; + } + return created; + } - unsigned int created; + /* not using systemd socket activation, initialize listening sockets: */ - if (!io_library_init(CONNECTION_POOL)) { - Log(LOG_EMERG, "Cannot initialize IO routines: %s", strerror(errno)); - return -1; + /* can't use Conf_ListenAddress directly, see below */ + copy = strdup(Conf_ListenAddress); + if (!copy) { + Log(LOG_CRIT, "Cannot copy %s: %s", Conf_ListenAddress, + strerror(errno)); + return 0; + } + listen_addr = strtok(copy, ","); + + while (listen_addr) { + ngt_TrimStr(listen_addr); + if (*listen_addr) { + created += Init_Listeners(&Conf_ListenPorts, + listen_addr, cb_listen); +#ifdef SSL_SUPPORT + created += Init_Listeners(&Conf_SSLOptions.ListenPorts, + listen_addr, cb_listen_ssl); +#endif + } + + listen_addr = strtok(NULL, ","); } - created = ports_initlisteners(&Conf_ListenPorts, cb_listen); + /* Can't free() Conf_ListenAddress here: on REHASH, if the config file + * cannot be re-loaded, we'd end up with a NULL Conf_ListenAddress. + * Instead, free() takes place in conf.c, before the config file + * is being parsed. */ + free(copy); return created; } /* Conn_InitListeners */ - +/** + * Shut down all listening sockets. + */ GLOBAL void Conn_ExitListeners( void ) { /* Close down all listening sockets */ int *fd; size_t arraylen; -#ifdef ZEROCONF - Rendezvous_UnregisterListeners( ); -#endif + /* Get number of listening sockets to shut down. There can be none + * if ngIRCd has been "socket activated" by systemd. */ arraylen = array_length(&My_Listeners, sizeof (int)); - Log( LOG_INFO, "Shutting down all listening sockets (%d total)...", arraylen ); + if (arraylen < 1) + return; + + Log(LOG_INFO, + "Shutting down all listening sockets (%d total) ...", arraylen); fd = array_start(&My_Listeners); while(arraylen--) { - assert(fd); + assert(fd != NULL); assert(*fd >= 0); io_close(*fd); -#ifdef DEBUG - Log( LOG_DEBUG, "Listening socket %d closed.", *fd ); -#endif + LogDebug("Listening socket %d closed.", *fd ); fd++; } array_free(&My_Listeners); } /* Conn_ExitListeners */ +/** + * Bind a socket to a specific (source) address. + * + * @param addr Address structure. + * @param listen_addrstr Source address as string. + * @param Port Port number. + * @returns true on success, false otherwise. + */ +static bool +InitSinaddrListenAddr(ng_ipaddr_t *addr, const char *listen_addrstr, UINT16 Port) +{ + bool ret; + + ret = ng_ipaddr_init(addr, listen_addrstr, Port); + if (!ret) { + assert(listen_addrstr); + Log(LOG_CRIT, + "Can't bind to [%s]:%u: can't convert ip address \"%s\"!", + listen_addrstr, Port, listen_addrstr); + } + return ret; +} -/* return new listening port file descriptor or -1 on failure */ -static int -NewListener( const UINT16 Port ) +/** + * Set a socket to "IPv6 only". If the given socket doesn't belong to the + * AF_INET6 family, or the operating system doesn't support this functionality, + * this function retruns silently. + * + * @param af Address family of the socket. + * @param sock Socket handle. + */ +static void +set_v6_only(int af, int sock) { - /* Create new listening socket on specified port */ +#if defined(IPV6_V6ONLY) && defined(WANT_IPV6) + int on = 1; - struct sockaddr_in addr; - struct in_addr inaddr; - int sock; -#ifdef ZEROCONF - char name[CLIENT_ID_LEN], *info; -#endif + if (af != AF_INET6) + return; - /* Server-"Listen"-Socket initialisieren */ - memset( &addr, 0, sizeof( addr )); - memset( &inaddr, 0, sizeof( inaddr )); - addr.sin_family = AF_INET; - addr.sin_port = htons( Port ); - if( Conf_ListenAddress[0] ) - { -#ifdef HAVE_INET_ATON - if( inet_aton( Conf_ListenAddress, &inaddr ) == 0 ) + if (setsockopt(sock, IPPROTO_IPV6, IPV6_V6ONLY, &on, (socklen_t)sizeof(on))) + Log(LOG_ERR, "Could not set IPV6_V6ONLY: %s", strerror(errno)); #else - inaddr.s_addr = inet_addr( Conf_ListenAddress ); - if( inaddr.s_addr == (unsigned)-1 ) + (void)af; + (void)sock; #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; +} + +/** + * Initialize new listening port. + * + * @param listen_addr Local address to bind the socet to (can be 0.0.0.0). + * @param Port Port number on which the new socket should be listening. + * @returns file descriptor of the socket or -1 on failure. + */ +static int +NewListener(const char *listen_addr, UINT16 Port) +{ + /* Create new listening socket on specified port */ + ng_ipaddr_t addr; + int sock, af; - sock = socket( PF_INET, SOCK_STREAM, 0); - if( sock < 0 ) { - Log( LOG_CRIT, "Can't create socket: %s!", strerror( errno )); + if (!InitSinaddrListenAddr(&addr, listen_addr, Port)) + return -1; + + af = ng_ipaddr_af(&addr); + sock = socket(af, SOCK_STREAM, 0); + if (sock < 0) { + Log(LOG_CRIT, "Can't create socket (af %d) : %s!", af, + strerror(errno)); return -1; } - if( ! Init_Socket( sock )) return -1; + set_v6_only(af, sock); - if( bind( sock, (struct sockaddr *)&addr, (socklen_t)sizeof( addr )) != 0 ) { - Log( LOG_CRIT, "Can't bind socket: %s!", strerror( errno )); - close( sock ); + if (!Init_Socket(sock)) return -1; - } - if( listen( sock, 10 ) != 0 ) { - Log( LOG_CRIT, "Can't listen on socket: %s!", strerror( errno )); - close( sock ); + if (bind(sock, (struct sockaddr *)&addr, ng_ipaddr_salen(&addr)) != 0) { + Log(LOG_CRIT, "Can't bind socket to address %s:%d - %s!", + ng_ipaddr_tostr(&addr), Port, strerror(errno)); + close(sock); return -1; } - /* keep fd in list so we can close it when ngircd restarts/shuts down */ - if (!array_catb( &My_Listeners,(char*) &sock, sizeof(int) )) { - Log( LOG_CRIT, "Can't add socket to My_Listeners array: %s!", strerror( errno )); - close( sock ); + if (listen(sock, 10) != 0) { + Log(LOG_CRIT, "Can't listen on socket: %s!", strerror(errno)); + close(sock); 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 ZEROCONF - /* Get best server description text */ - if( ! Conf_ServerInfo[0] ) info = Conf_ServerName; - else - { - /* Use server info string */ - info = NULL; - if( Conf_ServerInfo[0] == '[' ) - { - /* Cut off leading hostname part in "[]" */ - info = strchr( Conf_ServerInfo, ']' ); - if( info ) - { - info++; - while( *info == ' ' ) info++; - } - } - if( ! info ) info = Conf_ServerInfo; + /* keep fd in list so we can close it when ngircd restarts/shuts down */ + if (!array_catb(&My_Listeners, (char *)&sock, sizeof(int))) { + Log(LOG_CRIT, "Can't add socket to My_Listeners array: %s!", + strerror(errno)); + close(sock); + return -1; } - /* Add port number to description if non-standard */ - if( Port != 6667 ) snprintf( name, sizeof( name ), "%s (port %u)", info, Port ); - else strlcpy( name, info, sizeof( name )); - - /* Register service */ - Rendezvous_Register( name, MDNS_TYPE, Port ); -#endif + Log(LOG_INFO, "Now listening on [%s]:%d (socket %d).", + ng_ipaddr_tostr(&addr), Port, sock); return sock; } /* NewListener */ - +/** + * "Main Loop": Loop until shutdown or restart is signalled. + * + * This function loops until a shutdown or restart of ngIRCd is signalled and + * calls io_dispatch() to check for readable and writable sockets every second. + * It checks for status changes on pending connections (e. g. when a hostname + * has been resolved), checks for "penalties" and timeouts, and handles the + * input buffers. + */ GLOBAL void -Conn_Handler( void ) +Conn_Handler(void) { - /* "Main Loop.": Loop until a signal (for shutdown or restart) arrives. - * Call io_dispatch() to check for read/writeable sockets every second - * Wait for status change on pending connections (e.g: when the hostname has been resolved) - * check for penalty/timeouts - * handle input buffers - */ int i; - unsigned int wdatalen; + size_t wdatalen; struct timeval tv; time_t t; - bool timeout; - - while(( ! NGIRCd_SignalQuit ) && ( ! NGIRCd_SignalRestart )) { - timeout = true; - -#ifdef ZEROCONF - Rendezvous_Handler( ); -#endif - /* Should the configuration be reloaded? */ - if( NGIRCd_SignalRehash ) NGIRCd_Rehash( ); + while (!NGIRCd_SignalQuit && !NGIRCd_SignalRestart) { + t = time(NULL); /* Check configured servers and established links */ - Check_Servers( ); - Check_Connections( ); - - t = time( NULL ); - - /* noch volle Lese-Buffer suchen */ - for( i = 0; i < Pool_Size; i++ ) { - if(( My_Connections[i].sock > NONE ) && ( array_bytes(&My_Connections[i].rbuf) > 0 ) && - ( My_Connections[i].delaytime < t )) - { - /* Kann aus dem Buffer noch ein Befehl extrahiert werden? */ - if (Handle_Buffer( i )) timeout = false; + Check_Servers(); + Check_Connections(); + + /* Expire outdated class/list items */ + Class_Expire(); + + /* Look for non-empty read buffers ... */ + for (i = 0; i < Pool_Size; i++) { + if ((My_Connections[i].sock > NONE) + && (array_bytes(&My_Connections[i].rbuf) > 0)) { + /* ... and try to handle the received data */ + Handle_Buffer(i); } } - /* noch volle Schreib-Puffer suchen */ - for( i = 0; i < Pool_Size; i++ ) { - if ( My_Connections[i].sock <= NONE ) + /* Look for non-empty write buffers ... */ + for (i = 0; i < Pool_Size; i++) { + if (My_Connections[i].sock <= NONE) continue; wdatalen = array_bytes(&My_Connections[i].wbuf); - #ifdef ZLIB - if (( wdatalen > 0 ) || ( array_bytes(&My_Connections[i].zip.wbuf)> 0 )) + if (wdatalen > 0 || + array_bytes(&My_Connections[i].zip.wbuf) > 0) #else - if ( wdatalen > 0 ) + if (wdatalen > 0) #endif { - /* Socket der Verbindung in Set aufnehmen */ - io_event_add( My_Connections[i].sock, IO_WANTWRITE ); +#ifdef SSL_SUPPORT + if (SSL_WantRead(&My_Connections[i])) + continue; +#endif + io_event_add(My_Connections[i].sock, + IO_WANTWRITE); } } - /* von welchen Sockets koennte gelesen werden? */ - for (i = 0; i < Pool_Size; i++ ) { - if ( My_Connections[i].sock <= NONE ) + /* Check from which sockets we possibly could read ... */ + for (i = 0; i < Pool_Size; i++) { + if (My_Connections[i].sock <= NONE) continue; - - if (Resolve_INPROGRESS(&My_Connections[i].res_stat)) { - /* wait for completion of Resolver Sub-Process */ - io_event_del( My_Connections[i].sock, IO_WANTREAD ); +#ifdef SSL_SUPPORT + if (SSL_WantWrite(&My_Connections[i])) + /* TLS/SSL layer needs to write data; deal + * with this first! */ + continue; +#endif + if (Proc_InProgress(&My_Connections[i].proc_stat)) { + /* Wait for completion of forked subprocess + * and ignore the socket in the meantime ... */ + io_event_del(My_Connections[i].sock, + IO_WANTREAD); continue; } - if ( Conn_OPTION_ISSET( &My_Connections[i], CONN_ISCONNECTING )) - continue; /* wait for completion of connect() */ + if (Conn_OPTION_ISSET(&My_Connections[i], CONN_ISCONNECTING)) + /* Wait for completion of connect() ... */ + continue; - if( My_Connections[i].delaytime > t ) { - /* Fuer die Verbindung ist eine "Penalty-Zeit" gesetzt */ - io_event_del( My_Connections[i].sock, IO_WANTREAD ); + if (My_Connections[i].delaytime > t) { + /* There is a "penalty time" set: ignore socket! */ + io_event_del(My_Connections[i].sock, + IO_WANTREAD); continue; } - io_event_add( My_Connections[i].sock, IO_WANTREAD ); + + io_event_add(My_Connections[i].sock, IO_WANTREAD); } - /* (re-)set timeout - tv_sec/usec are undefined after io_dispatch() returns */ + /* Set the timeout for reading from the network to 1 second, + * which is the granularity with witch we handle "penalty + * times" for example. + * Note: tv_sec/usec are undefined(!) after io_dispatch() + * returns, so we have to set it before each call to it! */ tv.tv_usec = 0; - tv.tv_sec = timeout ? 1 : 0; - - /* wait for activity */ - i = io_dispatch( &tv ); - if (i == -1 && errno != EINTR ) { - Log(LOG_EMERG, "Conn_Handler(): io_dispatch(): %s!", strerror(errno)); - Log(LOG_ALERT, "%s exiting due to fatal errors!", PACKAGE_NAME); - exit( 1 ); + tv.tv_sec = 1; + + /* Wait for activity ... */ + i = io_dispatch(&tv); + if (i == -1 && errno != EINTR) { + Log(LOG_EMERG, "Conn_Handler(): io_dispatch(): %s!", + strerror(errno)); + Log(LOG_ALERT, "%s exiting due to fatal errors!", + PACKAGE_NAME); + exit(1); + } + + /* Should ngIRCd timeout when idle? */ + if (Conf_IdleTimeout > 0 && NumConnectionsAccepted > 0 + && idle_t > 0 && time(NULL) - idle_t >= Conf_IdleTimeout) { + LogDebug("Server idle timeout reached: %d second%s. Initiating shutdown ...", + Conf_IdleTimeout, + Conf_IdleTimeout == 1 ? "" : "s"); + NGIRCd_SignalQuit = true; } } - if( NGIRCd_SignalQuit ) Log( LOG_NOTICE|LOG_snotice, "Server going down NOW!" ); - else if( NGIRCd_SignalRestart ) Log( LOG_NOTICE|LOG_snotice, "Server restarting NOW!" ); + if (NGIRCd_SignalQuit) + Log(LOG_NOTICE | LOG_snotice, "Server going down NOW!"); + else if (NGIRCd_SignalRestart) + Log(LOG_NOTICE | LOG_snotice, "Server restarting NOW!"); } /* Conn_Handler */ - /** * Write a text string into the socket of a connection. + * * This function automatically appends CR+LF to the string and validates that * the result is a valid IRC message (oversized messages are shortened, for * example). Then it calls the Conn_Write() function to do the actual sending. - * @param Idx Index fo the connection. - * @param Format Format string, see printf(). - * @return true on success, false otherwise. + * + * @param Idx Index fo the connection. + * @param Format Format string, see printf(). + * @returns true on success, false otherwise. */ #ifdef PROTOTYPES GLOBAL bool -Conn_WriteStr( CONN_ID Idx, char *Format, ... ) +Conn_WriteStr(CONN_ID Idx, const char *Format, ...) #else GLOBAL bool -Conn_WriteStr( Idx, Format, va_alist ) +Conn_WriteStr(Idx, Format, va_alist) CONN_ID Idx; -char *Format; +const char *Format; va_dcl #endif { char buffer[COMMAND_LEN]; +#ifdef ICONV + char *ptr, *message; +#endif + size_t len; bool ok; va_list ap; + int r; assert( Idx > NONE ); assert( Format != NULL ); @@ -573,7 +820,8 @@ va_dcl #else va_start( ap ); #endif - if (vsnprintf( buffer, COMMAND_LEN - 2, Format, ap ) >= COMMAND_LEN - 2 ) { + r = vsnprintf(buffer, COMMAND_LEN - 2, Format, ap); + if (r >= COMMAND_LEN - 2 || r == -1) { /* * The string that should be written to the socket is longer * than the allowed size of COMMAND_LEN bytes (including both @@ -589,11 +837,18 @@ va_dcl * * So we have a big problem here: we should send more bytes * to the network than we are allowed to and we don't know - * the originator (any more). The "old" behaviour of blaming + * the originator (any more). The "old" behavior of blaming * the receiver ("next hop") is a bad idea (it could be just * an other server only routing the message!), so the only * option left is to shorten the string and to hope that the * result is still somewhat useful ... + * + * Note: + * C99 states that vsnprintf() "returns the number of characters + * that would have been printed if the n were unlimited"; but + * according to the Linux manual page "glibc until 2.0.6 would + * return -1 when the output was truncated" -- so we have to + * handle both cases ... * -alex- */ @@ -601,68 +856,126 @@ va_dcl CUT_TXTSUFFIX); } +#ifdef ICONV + ptr = strchr(buffer + 1, ':'); + if (ptr) { + ptr++; + message = Conn_EncodingTo(Idx, ptr); + if (message != ptr) + strlcpy(ptr, message, sizeof(buffer) - (ptr - buffer)); + } +#endif + #ifdef SNIFFER if (NGIRCd_Sniffer) Log(LOG_DEBUG, " -> connection %d: '%s'.", Idx, buffer); #endif - strlcat( buffer, "\r\n", sizeof( buffer )); - ok = Conn_Write( Idx, buffer, strlen( buffer )); + len = strlcat( buffer, "\r\n", sizeof( buffer )); + ok = Conn_Write(Idx, buffer, len); My_Connections[Idx].msg_out++; va_end( ap ); return ok; } /* Conn_WriteStr */ +GLOBAL char* +Conn_Password( CONN_ID Idx ) +{ + assert( Idx > NONE ); + if (My_Connections[Idx].pwd == NULL) + return (char*)"\0"; + else + return My_Connections[Idx].pwd; +} /* Conn_Password */ -GLOBAL bool -Conn_Write( CONN_ID Idx, char *Data, unsigned int Len ) +GLOBAL void +Conn_SetPassword( CONN_ID Idx, const char *Pwd ) { - /* Daten in Socket schreiben. Bei "fatalen" Fehlern wird - * der Client disconnectiert und false geliefert. */ + assert( Idx > NONE ); + if (My_Connections[Idx].pwd) + free(My_Connections[Idx].pwd); + + My_Connections[Idx].pwd = strdup(Pwd); + if (My_Connections[Idx].pwd == NULL) { + Log(LOG_EMERG, "Can't allocate memory! [Conn_SetPassword]"); + exit(1); + } +} /* Conn_SetPassword */ + +/** + * 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. + * @returns true on success, false otherwise. + */ +static bool +Conn_Write( CONN_ID Idx, char *Data, size_t Len ) +{ + CLIENT *c; + size_t writebuf_limit = WRITEBUFFER_MAX_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 ) - { -#ifdef DEBUG - Log( LOG_DEBUG, "Skipped write on closed socket (connection %d).", Idx ); -#endif + /* 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; } - /* 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; - - /* 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; - } - } + /* Make sure that there still exists a CLIENT structure associated + * with this connection and check if this is a server or not: */ + c = Conn_GetClient(Idx); + if (c) { + /* 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; + } else + LogDebug("Write on socket without client (connection %d)!?", Idx); #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 >= + WRITEBUFFER_FLUSH_LEN) { + /* 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 space exhausted (connection %d, limit is %lu bytes, %lu bytes new, %lu bytes pending)", + Idx, writebuf_limit, Len, + (unsigned long)array_bytes(&My_Connections[Idx].wbuf)); + Conn_Close(Idx, "Write buffer space exhausted", 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; @@ -674,16 +987,26 @@ Conn_Write( CONN_ID Idx, char *Data, unsigned int Len ) return true; } /* Conn_Write */ - +/** + * Shut down a connection. + * + * @param Idx Connection index. + * @param LogMsg Message to write to the log or NULL. If no LogMsg + * is given, the FwdMsg is logged. + * @param FwdMsg Message to forward to remote servers. + * @param InformClient If true, inform the client on the connection which is + * to be shut down of the reason (FwdMsg) and send + * connection statistics before disconnecting it. + */ GLOBAL void -Conn_Close( CONN_ID Idx, char *LogMsg, char *FwdMsg, bool InformClient ) +Conn_Close(CONN_ID Idx, const char *LogMsg, const char *FwdMsg, bool InformClient) { - /* Close connection. Open pipes of asyncronous resolver + /* Close connection. Open pipes of asynchronous resolver * sub-processes are closed down. */ 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; @@ -694,10 +1017,8 @@ Conn_Close( CONN_ID Idx, char *LogMsg, char *FwdMsg, bool InformClient ) /* Is this link already shutting down? */ if( Conn_OPTION_ISSET( &My_Connections[Idx], CONN_ISCLOSING )) { /* Conn_Close() has been called recursively for this link; - * probabe reason: Handle_Write() failed -- see below. */ -#ifdef DEBUG - Log( LOG_DEBUG, "Recursive request to close connection: %d", Idx ); -#endif + * probable reason: Handle_Write() failed -- see below. */ + LogDebug("Recursive request to close connection %d!", Idx ); return; } @@ -705,15 +1026,13 @@ 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 )); + 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 = Client_GetFromConn( Idx ); + c = Conn_GetClient( Idx ); /* Should the client be informed? */ if (InformClient) { @@ -728,12 +1047,11 @@ 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!) */ + /* Send ERROR to client (see RFC 2812, section 3.1.7) */ if (FwdMsg) Conn_WriteStr(Idx, "ERROR :%s", FwdMsg); else - Conn_WriteStr(Idx, "ERROR :Closing connection."); + Conn_WriteStr(Idx, "ERROR :Closing connection"); } /* Try to write out the write buffer. Note: Handle_Write() eventually @@ -743,41 +1061,58 @@ Conn_Close( CONN_ID Idx, char *LogMsg, char *FwdMsg, bool InformClient ) (void)Handle_Write( Idx ); /* Search client, if any (re-check!) */ - c = Client_GetFromConn( Idx ); - + c = Conn_GetClient( Idx ); +#ifdef SSL_SUPPORT + if ( Conn_OPTION_ISSET( &My_Connections[Idx], CONN_SSL )) { + LogDebug("SSL connection %d shutting down ...", Idx); + ConnSSL_Free(&My_Connections[Idx]); + } +#endif /* 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 ); - } - - /* cancel running resolver */ - if (Resolve_INPROGRESS(&My_Connections[Idx].res_stat)) { - Resolve_Shutdown(&My_Connections[Idx].res_stat); + Log(LOG_INFO, + "Connection %d with \"%s:%d\" closed (in: %.1fk, out: %.1fk).", + Idx, My_Connections[Idx].host, port, + in_k, out_k); } /* Servers: Modify time of next connect attempt? */ @@ -795,422 +1130,659 @@ Conn_Close( CONN_ID Idx, char *LogMsg, char *FwdMsg, bool InformClient ) array_free(&My_Connections[Idx].rbuf); array_free(&My_Connections[Idx].wbuf); + if (My_Connections[Idx].pwd != NULL) + free(My_Connections[Idx].pwd); + /* Clean up connection structure (=free it) */ Init_Conn_Struct( Idx ); -#ifdef DEBUG - Log( LOG_DEBUG, "Shutdown of connection %d completed.", Idx ); -#endif -} /* Conn_Close */ + assert(NumConnections > 0); + if (NumConnections) + NumConnections--; + LogDebug("Shutdown of connection %d completed, %ld connection%s left.", + Idx, NumConnections, NumConnections != 1 ? "s" : ""); + idle_t = NumConnections > 0 ? 0 : time(NULL); +} /* Conn_Close */ -GLOBAL void -Conn_SyncServerStruct( void ) +/** + * Get current number of connections. + * + * @returns Number of current connections. + */ +GLOBAL long +Conn_Count(void) +{ + return NumConnections; +} /* Conn_Count */ + +/** + * Get number of maximum simultaneous connections. + * + * @returns Number of maximum simultaneous connections. + */ +GLOBAL long +Conn_CountMax(void) { - /* Synchronize server structures (connection IDs): - * connections <-> configuration */ + return NumConnectionsMax; +} /* Conn_CountMax */ +/** + * Get number of connections accepted since the daemon startet. + * + * @returns Number of connections accepted. + */ +GLOBAL long +Conn_CountAccepted(void) +{ + return NumConnectionsAccepted; +} /* Conn_CountAccepted */ + +/** + * Synchronize established connections and configured server structures + * after a configuration update and store the correct connection IDs, if any. + */ +GLOBAL void +Conn_SyncServerStruct(void) +{ CLIENT *client; CONN_ID i; int c; - for( i = 0; i < Pool_Size; i++ ) - { - /* Established connection? */ - if( My_Connections[i].sock <= NONE ) continue; + for (i = 0; i < Pool_Size; i++) { + if (My_Connections[i].sock == NONE) + continue; - /* Server connection? */ - client = Client_GetFromConn( i ); - if(( ! client ) || ( Client_Type( client ) != CLIENT_SERVER )) continue; + /* Server link? */ + client = Conn_GetClient(i); + if (!client || Client_Type(client) != CLIENT_SERVER) + continue; - for( c = 0; c < MAX_SERVERS; c++ ) - { + for (c = 0; c < MAX_SERVERS; c++) { /* Configured server? */ - if( ! Conf_Server[c].host[0] ) continue; + if (!Conf_Server[c].host[0]) + continue; - /* Duplicate? */ - if( strcmp( Conf_Server[c].name, Client_ID( client )) == 0 ) Conf_Server[c].conn_id = i; + if (strcasecmp(Conf_Server[c].name, Client_ID(client)) == 0) + Conf_Server[c].conn_id = i; } } } /* SyncServerStruct */ +/** + * Get IP address string of a connection. + * + * @param Idx Connection index. + * @return Pointer to a global buffer containing the IP address as string. + */ +GLOBAL const char * +Conn_GetIPAInfo(CONN_ID Idx) +{ + assert(Idx > NONE); + return ng_ipaddr_tostr(&My_Connections[Idx].addr); +} +/** + * Send out data of write buffer; connect new sockets. + * + * @param Idx Connection index. + * @returns true on success, false otherwise. + */ static bool Handle_Write( CONN_ID Idx ) { - /* Daten aus Schreibpuffer versenden bzw. Connection aufbauen */ - - int len; - unsigned int wdatalen; + ssize_t len; + size_t wdatalen; assert( Idx > NONE ); if ( My_Connections[Idx].sock < 0 ) { -#ifdef DEBUG - Log(LOG_DEBUG, - "Handle_Write() on closed socket, connection %d", Idx); -#endif + LogDebug("Handle_Write() on closed socket, connection %d", Idx); return false; } assert( My_Connections[Idx].sock > NONE ); -#ifdef DEBUG - Log(LOG_DEBUG, "Handle_Write() called for connection %d ...", Idx); -#endif - 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); - - len = write(My_Connections[Idx].sock, - array_start(&My_Connections[Idx].wbuf), wdatalen ); +#if DEBUG_BUFFER + LogDebug + ("Handle_Write() called for connection %d, %ld bytes pending ...", + Idx, wdatalen); +#endif +#ifdef SSL_SUPPORT + if ( Conn_OPTION_ISSET( &My_Connections[Idx], CONN_SSL )) { + len = ConnSSL_Write(&My_Connections[Idx], + array_start(&My_Connections[Idx].wbuf), + wdatalen); + } else +#endif + { + len = write(My_Connections[Idx].sock, + array_start(&My_Connections[Idx].wbuf), wdatalen ); + } if( len < 0 ) { if (errno == EAGAIN || errno == EINTR) return true; - Log(LOG_ERR, "Write error on connection %d (socket %d): %s!", - Idx, My_Connections[Idx].sock, strerror(errno)); - Conn_Close(Idx, "Write error!", NULL, false); + if (!Conn_OPTION_ISSET(&My_Connections[Idx], CONN_ISCLOSING)) + Log(LOG_ERR, + "Write error on connection %d (socket %d): %s!", + Idx, My_Connections[Idx].sock, strerror(errno)); + else + LogDebug("Recursive write error on connection %d (socket %d): %s!", + Idx, My_Connections[Idx].sock, strerror(errno)); + Conn_Close(Idx, "Write error", NULL, false); return false; } /* move any data not yet written to beginning */ - array_moveleft(&My_Connections[Idx].wbuf, 1, len); + array_moveleft(&My_Connections[Idx].wbuf, 1, (size_t)len); return true; } /* Handle_Write */ - +/** + * Count established connections to a specific IP address. + * + * @returns Number of established connections. + */ static int -New_Connection( int Sock ) +Count_Connections(ng_ipaddr_t *a) { - /* Neue Client-Verbindung von Listen-Socket annehmen und - * CLIENT-Struktur anlegen. */ + 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 */ +/** + * Initialize new client connection on a listening socket. + * + * @param Sock Listening socket descriptor. + * @param IsSSL true if this socket expects SSL-encrypted data. + * @returns Accepted socket descriptor or -1 on error. + */ +static int +New_Connection(int Sock, UNUSED bool IsSSL) +{ #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; - CONN_ID idx; CLIENT *c; - POINTER *ptr; - long new_size, cnt; - - assert( Sock > NONE ); - /* Connection auf Listen-Socket annehmen */ - new_sock_len = sizeof( new_addr ); - new_sock = accept( Sock, (struct sockaddr *)&new_addr, (socklen_t *)&new_sock_len ); - if( new_sock < 0 ) - { - Log( LOG_CRIT, "Can't accept connection: %s!", strerror( errno )); + long cnt; + + assert(Sock > NONE); + + LogDebug("Accepting new connection on socket %d ...", Sock); + + new_sock_len = (int)sizeof(new_addr); + new_sock = accept(Sock, (struct sockaddr *)&new_addr, + (socklen_t *)&new_sock_len); + if (new_sock < 0) { + Log(LOG_CRIT, "Can't accept connection: %s!", strerror(errno)); + return -1; + } + NumConnectionsAccepted++; + + 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); return -1; } #ifdef TCPWRAP /* Validate socket using TCP Wrappers */ - request_init( &req, RQ_DAEMON, PACKAGE_NAME, RQ_FILE, new_sock, RQ_CLIENT_SIN, &new_addr, NULL ); + 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 )); - Simple_Message( new_sock, "ERROR :Connection refused" ); - close( new_sock ); + 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; } #endif - /* Socket initialisieren */ - Init_Socket( new_sock ); - + if (!Init_Socket(new_sock)) + return -1; + + /* Check global connection limit */ + if ((Conf_MaxConnections > 0) && + (NumConnections >= (size_t) Conf_MaxConnections)) { + Log(LOG_ALERT, "Can't accept connection: limit (%d) reached!", + Conf_MaxConnections); + Simple_Message(new_sock, "ERROR :Connection limit reached"); + close(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); - Simple_Message( new_sock, "ERROR :Connection refused, too many connections from your IP address!" ); - close( new_sock ); + 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; } - /* Freie Connection-Struktur suchen */ - for( idx = 0; idx < Pool_Size; idx++ ) if( My_Connections[idx].sock == NONE ) break; - if( idx >= Pool_Size ) - { - new_size = Pool_Size + CONNECTION_POOL; - - /* Im bisherigen Pool wurde keine freie Connection-Struktur mehr gefunden. - * Wenn erlaubt und moeglich muss nun der Pool vergroessert werden: */ - - if( Conf_MaxConnections > 0 ) - { - /* Es ist ein Limit konfiguriert */ - if( Pool_Size >= Conf_MaxConnections ) - { - /* Mehr Verbindungen duerfen wir leider nicht mehr annehmen ... */ - Log( LOG_ALERT, "Can't accept connection: limit (%d) reached!", Pool_Size ); - Simple_Message( new_sock, "ERROR :Connection limit reached" ); - close( new_sock ); - return -1; - } - if( new_size > Conf_MaxConnections ) new_size = Conf_MaxConnections; - } - if( new_size < Pool_Size ) - { - Log( LOG_ALERT, "Can't accept connection: limit (%d) reached -- overflow!", Pool_Size ); - Simple_Message( new_sock, "ERROR :Connection limit reached" ); - close( new_sock ); - return -1; - } - - ptr = (POINTER *)realloc( My_Connections, sizeof( CONNECTION ) * new_size ); - if( ! ptr ) { - Log( LOG_EMERG, "Can't allocate memory! [New_Connection]" ); - Simple_Message( new_sock, "ERROR: Internal error" ); - close( new_sock ); + if (new_sock >= Pool_Size) { + if (!array_alloc(&My_ConnArray, sizeof(CONNECTION), + (size_t) new_sock)) { + Log(LOG_EMERG, + "Can't allocate memory! [New_Connection]"); + Simple_Message(new_sock, "ERROR: Internal error"); + close(new_sock); return -1; } - -#ifdef DEBUG - Log( LOG_DEBUG, "Allocated new connection pool for %ld items (%ld bytes). [realloc()]", new_size, sizeof( CONNECTION ) * new_size ); -#endif + LogDebug("Bumped connection pool to %ld items (internal: %ld items, %ld bytes)", + new_sock, array_length(&My_ConnArray, + sizeof(CONNECTION)), array_bytes(&My_ConnArray)); /* Adjust pointer to new block */ - My_Connections = (CONNECTION *)ptr; - - /* Initialize new items */ - for( idx = Pool_Size; idx < new_size; idx++ ) Init_Conn_Struct( idx ); - idx = Pool_Size; - - /* Adjust new pool size */ - Pool_Size = new_size; + My_Connections = array_start(&My_ConnArray); + while (Pool_Size <= new_sock) + Init_Conn_Struct(Pool_Size++); } - /* Client-Struktur initialisieren */ - c = Client_NewLocal( idx, inet_ntoa( new_addr.sin_addr ), 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 ); + /* 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; } - /* Verbindung registrieren */ - Init_Conn_Struct( idx ); - My_Connections[idx].sock = new_sock; - My_Connections[idx].addr = new_addr; - - /* Neuen Socket registrieren */ - if (!io_event_create( new_sock, IO_WANTREAD, cb_clientserver)) { - Simple_Message( new_sock, "ERROR :Internal error" ); - Conn_Close( idx, "io_event_create() failed", NULL, false ); + c = Client_NewLocal(new_sock, NULL, CLIENT_UNKNOWN, false); + if (!c) { + 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; } - Log( LOG_INFO, "Accepted connection %d from %s:%d on socket %d.", idx, inet_ntoa( new_addr.sin_addr ), ntohs( new_addr.sin_port), Sock ); + Init_Conn_Struct(new_sock); + My_Connections[new_sock].sock = new_sock; + My_Connections[new_sock].addr = new_addr; + My_Connections[new_sock].client = c; + + /* Set initial hostname to IP address. This becomes overwritten when + * the DNS lookup is enabled and succeeds, but is used otherwise. */ + if (ng_ipaddr_af(&new_addr) != AF_INET) + snprintf(My_Connections[new_sock].host, + sizeof(My_Connections[new_sock].host), "[%s]", ip_str); + else + strlcpy(My_Connections[new_sock].host, ip_str, + sizeof(My_Connections[new_sock].host)); + + Client_SetHostname(c, My_Connections[new_sock].host); - /* Hostnamen ermitteln */ - strlcpy( My_Connections[idx].host, inet_ntoa( new_addr.sin_addr ), sizeof( My_Connections[idx].host )); - Client_SetHostname( c, My_Connections[idx].host ); + Log(LOG_INFO, "Accepted connection %d from \"%s:%d\" on socket %d.", + new_sock, My_Connections[new_sock].host, + ng_ipaddr_getport(&new_addr), Sock); + Account_Connection(); - Resolve_Addr(&My_Connections[idx].res_stat, &new_addr, - My_Connections[idx].sock, cb_Read_Resolver_Result); +#ifdef SSL_SUPPORT + /* Delay connection initalization until SSL handshake is finished */ + if (!IsSSL) +#endif + Conn_StartLogin(new_sock); - /* Penalty-Zeit setzen */ - Conn_SetPenalty( idx, 4 ); return new_sock; } /* New_Connection */ - -static CONN_ID -Socket2Index( int Sock ) +/** + * Finish connection initialization, start resolver subprocess. + * + * @param Idx Connection index. + */ +GLOBAL void +Conn_StartLogin(CONN_ID Idx) { - /* zum Socket passende Connection suchen */ + int ident_sock = -1; - CONN_ID idx; + assert(Idx >= 0); - assert( Sock > NONE ); + /* Nothing to do if DNS (and resolver subprocess) is disabled */ + if (!Conf_DNS) + return; - for( idx = 0; idx < Pool_Size; idx++ ) if( My_Connections[idx].sock == Sock ) break; +#ifdef IDENTAUTH + /* Should we make an IDENT request? */ + if (Conf_Ident) + ident_sock = My_Connections[Idx].sock; +#endif - if( idx >= Pool_Size ) - { - /* die Connection wurde vermutlich (wegen eines - * Fehlers) bereits wieder abgebaut ... */ -#ifdef DEBUG - Log( LOG_DEBUG, "Socket2Index: can't get connection for socket %d!", Sock ); + if (Conf_NoticeAuth) { + /* Send "NOTICE AUTH" messages to the client */ +#ifdef IDENTAUTH + if (Conf_Ident) + (void)Conn_WriteStr(Idx, + "NOTICE AUTH :*** Looking up your hostname and checking ident"); + else #endif + (void)Conn_WriteStr(Idx, + "NOTICE AUTH :*** Looking up your hostname"); + /* Send buffered data to the client, but break on errors + * because Handle_Write() would have closed the connection + * again in this case! */ + if (!Handle_Write(Idx)) + return; + } + + Resolve_Addr(&My_Connections[Idx].proc_stat, &My_Connections[Idx].addr, + ident_sock, cb_Read_Resolver_Result); +} + +/** + * Update global connection counters. + */ +static void +Account_Connection(void) +{ + NumConnections++; + idle_t = 0; + if (NumConnections > NumConnectionsMax) + NumConnectionsMax = NumConnections; + LogDebug("Total number of connections now %lu (max %lu).", + NumConnections, NumConnectionsMax); +} /* Account_Connection */ + +/** + * Translate socket handle into connection index. + * + * @param Sock Socket handle. + * @returns Connecion index or NONE, if no connection could be found. + */ +static CONN_ID +Socket2Index( int Sock ) +{ + assert( Sock >= 0 ); + + if( Sock >= Pool_Size || My_Connections[Sock].sock != Sock ) { + /* the Connection was already closed again, likely due to + * an error. */ + LogDebug("Socket2Index: can't get connection for socket %d!", Sock); return NONE; } - else return idx; + return Sock; } /* Socket2Index */ - +/** + * Read data from the network to the read buffer. If an error occurs, + * the socket of this connection will be shut down. + * + * @param Idx Connection index. + */ static void Read_Request( CONN_ID Idx ) { - /* Daten von Socket einlesen und entsprechend behandeln. - * Tritt ein Fehler auf, so wird der Socket geschlossen. */ - - int len; - char readbuf[1024]; + ssize_t len; + static const unsigned int maxbps = COMMAND_LEN / 2; + char readbuf[READBUFFER_LEN]; + time_t t; 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)); - Conn_Close( Idx, "Receive buffer overflow!", NULL, false ); + /* Read buffer is full */ + Log(LOG_ERR, + "Receive buffer space exhausted (connection %d): %d/%d bytes", + Idx, array_bytes(&My_Connections[Idx].rbuf), READBUFFER_LEN); + Conn_Close(Idx, "Receive buffer space exhausted", 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 ); +#ifdef SSL_SUPPORT + if (Conn_OPTION_ISSET(&My_Connections[Idx], CONN_SSL)) + len = ConnSSL_Read( &My_Connections[Idx], readbuf, sizeof(readbuf)); + else +#endif + len = read(My_Connections[Idx].sock, readbuf, sizeof(readbuf)); + if (len == 0) { + LogDebug("Client \"%s:%u\" is closing connection %d ...", + My_Connections[Idx].host, + ng_ipaddr_tostr(&My_Connections[Idx].addr), Idx); + Conn_Close(Idx, NULL, "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 - if ( Conn_OPTION_ISSET( &My_Connections[Idx], CONN_ZIP )) { - if (!array_catb( &My_Connections[Idx].zip.rbuf, readbuf, len)) { - Log( LOG_ERR, "Could not append recieved data to zip input buffer (connn %d): %d bytes!", Idx, len ); - Conn_Close( Idx, "Receive buffer overflow!", NULL, false ); + if (Conn_OPTION_ISSET(&My_Connections[Idx], CONN_ZIP)) { + if (!array_catb(&My_Connections[Idx].zip.rbuf, readbuf, + (size_t) len)) { + Log(LOG_ERR, + "Could not append received data to zip input buffer (connection %d): %d bytes!", + Idx, len); + Conn_Close(Idx, "Receive buffer space exhausted", NULL, + false); return; } } else #endif { - readbuf[len] = 0; - if (!array_cats( &My_Connections[Idx].rbuf, readbuf )) { - 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 ); + if (!array_catb( &My_Connections[Idx].rbuf, readbuf, len)) { + Log(LOG_ERR, + "Could not append received data to input buffer (connection %d): %d bytes!", + Idx, len); + Conn_Close(Idx, "Receive buffer space exhausted", NULL, + false ); } } /* Update connection statistics */ My_Connections[Idx].bytes_in += len; + /* Handle read buffer */ + My_Connections[Idx].bps += Handle_Buffer(Idx); + + /* Make sure that there is still a valid client registered */ + c = Conn_GetClient(Idx); + if (!c) + return; + /* Update timestamp of last data received if this connection is * registered as a user, server or service connection. Don't update * otherwise, so users have at least Conf_PongTimeout seconds time to - * register with the IRC server -- see Check_Connections(). */ - c = Client_GetFromConn(Idx); - if (c && (Client_Type(c) == CLIENT_USER - || Client_Type(c) == CLIENT_SERVER - || Client_Type(c) == CLIENT_SERVICE)) - My_Connections[Idx].lastdata = time(NULL); + * register with the IRC server -- see Check_Connections(). + * Update "lastping", too, if time shifted backwards ... */ + if (Client_Type(c) == CLIENT_USER + || Client_Type(c) == CLIENT_SERVER + || Client_Type(c) == CLIENT_SERVICE) { + t = time(NULL); + if (My_Connections[Idx].lastdata != t) + My_Connections[Idx].bps = 0; + + My_Connections[Idx].lastdata = t; + if (My_Connections[Idx].lastping > t) + My_Connections[Idx].lastping = t; + } /* Look at the data in the (read-) buffer of this connection */ - Handle_Buffer(Idx); + if (My_Connections[Idx].bps >= maxbps) + Throttle_Connection(Idx, c, THROTTLE_BPS, maxbps); } /* Read_Request */ - -static bool -Handle_Buffer( CONN_ID Idx ) +/** + * Handle all data in the connection read-buffer. + * + * Data is processed until no complete command is left in the read buffer, + * or MAX_COMMANDS[_SERVER|_SERVICE] commands were processed. + * When a fatal error occurs, the connection is shut down. + * + * @param Idx Index of the connection. + * @returns Number of bytes processed. + */ +static unsigned int +Handle_Buffer(CONN_ID Idx) { - /* Handle Data in Connections Read-Buffer. - * Return true if a reuqest was handled, false otherwise (also returned on errors). */ #ifndef STRICT_RFC - char *ptr1, *ptr2; + char *ptr1, *ptr2, *first_eol; #endif char *ptr; - int len, delta; - bool result; + size_t len, delta; + time_t starttime; #ifdef ZLIB bool old_z; #endif + unsigned int i, maxcmd = MAX_COMMANDS, len_processed = 0; + CLIENT *c; - result = false; - for (;;) { + c = Conn_GetClient(Idx); + starttime = time(NULL); + + assert(c != NULL); + + /* Servers get special command limits that depend on the user count */ + switch (Client_Type(c)) { + case CLIENT_SERVER: + maxcmd = (int)(Client_UserCount() / 5) + + MAX_COMMANDS_SERVER_MIN; + /* Allow servers to handle even more commands while peering + * to speed up server login and network synchronization. */ + if (Conn_LastPing(Idx) == 0) + maxcmd *= 5; + break; + case CLIENT_SERVICE: + maxcmd = MAX_COMMANDS_SERVICE; + break; + case CLIENT_USER: + if (Client_HasMode(c, 'F')) + maxcmd = MAX_COMMANDS_SERVICE; + break; + } + + for (i=0; i < maxcmd; i++) { /* Check penalty */ - if( My_Connections[Idx].delaytime > time( NULL )) return result; + if (My_Connections[Idx].delaytime > starttime) + return 0; #ifdef ZLIB - /* unpack compressed data */ - if ( Conn_OPTION_ISSET( &My_Connections[Idx], CONN_ZIP )) - if( ! Unzip_Buffer( Idx )) return false; + /* Unpack compressed data, if compression is in use */ + if (Conn_OPTION_ISSET(&My_Connections[Idx], CONN_ZIP)) { + /* When unzipping fails, Unzip_Buffer() shuts + * down the connection itself */ + if (!Unzip_Buffer(Idx)) + return 0; + } #endif if (0 == array_bytes(&My_Connections[Idx].rbuf)) break; - if (!array_cat0_temporary(&My_Connections[Idx].rbuf)) /* make sure buf is NULL terminated */ - return false; + /* Make sure that the buffer is NULL terminated */ + if (!array_cat0_temporary(&My_Connections[Idx].rbuf)) { + Conn_Close(Idx, NULL, + "Can't allocate memory [Handle_Buffer]", + true); + return 0; + } - /* A Complete Request end with CR+LF, see RFC 2812. */ - ptr = strstr( array_start(&My_Connections[Idx].rbuf), "\r\n" ); + /* RFC 2812, section "2.3 Messages", 5th paragraph: + * "IRC messages are always lines of characters terminated + * with a CR-LF (Carriage Return - Line Feed) pair [...]". */ + delta = 2; + ptr = strstr(array_start(&My_Connections[Idx].rbuf), "\r\n"); - if( ptr ) delta = 2; /* complete request */ #ifndef STRICT_RFC - else { - /* Check for non-RFC-compliant request (only CR or LF)? Unfortunately, - * there are quite a few clients that do this (incl. "mIRC" :-( */ - ptr1 = strchr( array_start(&My_Connections[Idx].rbuf), '\r' ); - ptr2 = strchr( array_start(&My_Connections[Idx].rbuf), '\n' ); + /* Check for non-RFC-compliant request (only CR or LF)? + * Unfortunately, there are quite a few clients out there + * that do this -- e. g. mIRC, BitchX, and Trillian :-( */ + ptr1 = strchr(array_start(&My_Connections[Idx].rbuf), '\r'); + ptr2 = strchr(array_start(&My_Connections[Idx].rbuf), '\n'); + if (ptr) { + /* Check if there is a single CR or LF _before_ the + * correct CR+LF line terminator: */ + first_eol = ptr1 < ptr2 ? ptr1 : ptr2; + if (first_eol < ptr) { + /* Single CR or LF before CR+LF found */ + ptr = first_eol; + delta = 1; + } + } else if (ptr1 || ptr2) { + /* No CR+LF terminated command found, but single + * CR or LF found ... */ + if (ptr1 && ptr2) + ptr = ptr1 < ptr2 ? ptr1 : ptr2; + else + ptr = ptr1 ? ptr1 : ptr2; delta = 1; - if( ptr1 && ptr2 ) ptr = ptr1 > ptr2 ? ptr2 : ptr1; - else if( ptr1 ) ptr = ptr1; - else if( ptr2 ) ptr = ptr2; } #endif - if( ! ptr ) + if (!ptr) break; - /* End of request found */ + /* Complete (=line terminated) request found, handle it! */ *ptr = '\0'; - len = ( ptr - (char*) array_start(&My_Connections[Idx].rbuf)) + delta; - - if( len < 0 || len > ( COMMAND_LEN - 1 )) { - /* Request must not exceed 512 chars (incl. CR+LF!), see - * RFC 2812. Disconnect Client if this happens. */ - Log( LOG_ERR, "Request too long (connection %d): %d bytes (max. %d expected)!", - Idx, array_bytes(&My_Connections[Idx].rbuf), COMMAND_LEN - 1 ); - Conn_Close( Idx, NULL, "Request too long", true ); - return false; + len = ptr - (char *)array_start(&My_Connections[Idx].rbuf) + delta; + + if (len > (COMMAND_LEN - 1)) { + /* Request must not exceed 512 chars (incl. CR+LF!), + * see RFC 2812. Disconnect Client if this happens. */ + Log(LOG_ERR, + "Request too long (connection %d): %d bytes (max. %d expected)!", + Idx, array_bytes(&My_Connections[Idx].rbuf), + COMMAND_LEN - 1); + Conn_Close(Idx, NULL, "Request too long", true); + return 0; } - if (len <= 2) { /* request was empty (only '\r\n') */ - array_moveleft(&My_Connections[Idx].rbuf, 1, delta); /* delta is either 1 or 2 */ - break; + len_processed += (unsigned int)len; + if (len <= delta) { + /* Request is empty (only '\r\n', '\r' or '\n'); + * delta is 2 ('\r\n') or 1 ('\r' or '\n'), see above */ + array_moveleft(&My_Connections[Idx].rbuf, 1, len); + continue; } #ifdef ZLIB /* remember if stream is already compressed */ @@ -1218,82 +1790,89 @@ Handle_Buffer( CONN_ID Idx ) #endif My_Connections[Idx].msg_in++; - if (!Parse_Request(Idx, (char*)array_start(&My_Connections[Idx].rbuf) )) - return false; - - result = true; + if (!Parse_Request + (Idx, (char *)array_start(&My_Connections[Idx].rbuf))) + return 0; /* error -> connection has been closed */ array_moveleft(&My_Connections[Idx].rbuf, 1, len); -#ifdef DEBUG - Log(LOG_DEBUG, - "Connection %d: %d bytes left in read buffer.", - Idx, array_bytes(&My_Connections[Idx].rbuf)); -#endif #ifdef ZLIB - if(( ! old_z ) && ( My_Connections[Idx].options & CONN_ZIP ) && - ( array_bytes(&My_Connections[Idx].rbuf) > 0 )) - { - /* 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 ((!old_z) && (My_Connections[Idx].options & CONN_ZIP) && + (array_bytes(&My_Connections[Idx].rbuf) > 0)) { + /* The last command activated socket compression. + * Data that was read after that needs to be copied + * to the unzip buffer for decompression: */ + if (!array_copy + (&My_Connections[Idx].zip.rbuf, + &My_Connections[Idx].rbuf)) { + Conn_Close(Idx, NULL, + "Can't allocate memory [Handle_Buffer]", + true); + return 0; } - if (!array_copy( &My_Connections[Idx].zip.rbuf, &My_Connections[Idx].rbuf )) - return false; array_trunc(&My_Connections[Idx].rbuf); -#ifdef DEBUG - Log( LOG_DEBUG, "Moved already received data (%u bytes) to uncompression buffer.", - array_bytes(&My_Connections[Idx].zip.rbuf)); -#endif /* DEBUG */ + LogDebug + ("Moved already received data (%u bytes) to uncompression buffer.", + array_bytes(&My_Connections[Idx].zip.rbuf)); } -#endif /* ZLIB */ +#endif } +#if DEBUG_BUFFER + LogDebug("Connection %d: Processed %ld commands (max=%ld), %ld bytes. %ld bytes left in read buffer.", + Idx, i, maxcmd, len_processed, + array_bytes(&My_Connections[Idx].rbuf)); +#endif - return result; -} /* Handle_Buffer */ + /* If data has been processed but there is still data in the read + * buffer, the command limit triggered. Enforce the penalty time: */ + if (len_processed && array_bytes(&My_Connections[Idx].rbuf) > 2) + Throttle_Connection(Idx, c, THROTTLE_CMDS, maxcmd); + return len_processed; +} /* Handle_Buffer */ +/** + * Check whether established connections are still alive or not. + * If not, play PING-PONG first; and if that doesn't help either, + * disconnect the respective peer. + */ static void -Check_Connections( void ) +Check_Connections(void) { - /* check if connections are alive. if not, play PING-PONG first. - * if this doesn't help either, disconnect client. */ CLIENT *c; CONN_ID i; + char msg[64]; - for( i = 0; i < Pool_Size; i++ ) { + for (i = 0; i < Pool_Size; i++) { if (My_Connections[i].sock < 0) continue; - c = Client_GetFromConn( i ); - if( c && (( Client_Type( c ) == CLIENT_USER ) || ( Client_Type( c ) == CLIENT_SERVER ) || ( Client_Type( c ) == CLIENT_SERVICE ))) - { + c = Conn_GetClient(i); + if (c && ((Client_Type(c) == CLIENT_USER) + || (Client_Type(c) == CLIENT_SERVER) + || (Client_Type(c) == CLIENT_SERVICE))) { /* connected User, Server or Service */ - if( My_Connections[i].lastping > My_Connections[i].lastdata ) { - /* we already sent a ping */ - if( My_Connections[i].lastping < time( NULL ) - Conf_PongTimeout ) { + if (My_Connections[i].lastping > + My_Connections[i].lastdata) { + /* We already sent a ping */ + if (My_Connections[i].lastping < + time(NULL) - Conf_PongTimeout) { /* Timeout */ -#ifdef DEBUG - Log( LOG_DEBUG, "Connection %d: Ping timeout: %d seconds.", i, Conf_PongTimeout ); -#endif - Conn_Close( i, NULL, "Ping timeout", true ); + snprintf(msg, sizeof(msg), + "Ping timeout: %d seconds", + Conf_PongTimeout); + LogDebug("Connection %d: %s.", i, msg); + Conn_Close(i, NULL, msg, true); } + } else if (My_Connections[i].lastdata < + time(NULL) - Conf_PingTimeout) { + /* We need to send a PING ... */ + LogDebug("Connection %d: sending PING ...", i); + Conn_UpdatePing(i); + Conn_WriteStr(i, "PING :%s", + Client_ID(Client_ThisServer())); } - else if( My_Connections[i].lastdata < time( NULL ) - Conf_PingTimeout ) { - /* we need to sent a PING */ -#ifdef DEBUG - Log( LOG_DEBUG, "Connection %d: sending PING ...", i ); -#endif - My_Connections[i].lastping = time( NULL ); - Conn_WriteStr( i, "PING :%s", Client_ID( Client_ThisServer( ))); - } - } - else - { + } else { /* The connection is not fully established yet, so * we don't do the PING-PONG game here but instead * disconnect the client after "a short time" if it's @@ -1301,266 +1880,363 @@ Check_Connections( void ) if (My_Connections[i].lastdata < time(NULL) - Conf_PongTimeout) { -#ifdef DEBUG - Log(LOG_DEBUG, - "Unregistered connection %d timed out ...", - i); -#endif + LogDebug + ("Unregistered connection %d timed out ...", + i); Conn_Close(i, NULL, "Timeout", false); } } } } /* Check_Connections */ - +/** + * Check if further server links should be established. + */ static void -Check_Servers( void ) +Check_Servers(void) { - /* Check if we can establish further server links */ - - CONN_ID idx; int i, n; time_t time_now; - /* Search all connections, are there results from the resolver? */ - for( idx = 0; idx < Pool_Size; idx++ ) { - if( My_Connections[idx].sock != SERVER_WAIT ) continue; - - /* IP resolved? */ - if (Resolve_SUCCESS(&My_Connections[idx].res_stat)) - New_Server(Conf_GetServer( idx ), idx); - } + time_now = time(NULL); /* Check all configured servers */ - for( i = 0; i < MAX_SERVERS; i++ ) { - /* Valid outgoing server which isn't already connected or disabled? */ - if(( ! Conf_Server[i].host[0] ) || ( ! Conf_Server[i].port > 0 ) || - ( Conf_Server[i].conn_id > NONE ) || ( Conf_Server[i].flags & CONF_SFLAG_DISABLED )) - continue; + for (i = 0; i < MAX_SERVERS; i++) { + if (Conf_Server[i].conn_id != NONE) + continue; /* Already establishing or connected */ + if (!Conf_Server[i].host[0] || Conf_Server[i].port <= 0) + continue; /* No host and/or port configured */ + if (Conf_Server[i].flags & CONF_SFLAG_DISABLED) + continue; /* Disabled configuration entry */ + if (Conf_Server[i].lasttry > (time_now - Conf_ConnectRetry)) + continue; /* We have to wait a little bit ... */ /* Is there already a connection in this group? */ - if( Conf_Server[i].group > NONE ) { + if (Conf_Server[i].group > NONE) { for (n = 0; n < MAX_SERVERS; n++) { - if (n == i) continue; - if ((Conf_Server[n].conn_id > NONE) && - (Conf_Server[n].group == Conf_Server[i].group)) - break; + if (n == i) + continue; + if ((Conf_Server[n].conn_id != NONE) && + (Conf_Server[n].group == Conf_Server[i].group)) + break; } - if (n < MAX_SERVERS) continue; + if (n < MAX_SERVERS) + continue; } - /* Check last connect attempt? */ - time_now = time(NULL); - if( Conf_Server[i].lasttry > (time_now - Conf_ConnectRetry)) - continue; - /* Okay, try to connect now */ + Log(LOG_NOTICE, + "Preparing to establish a new server link for \"%s\" ...", + Conf_Server[i].name); Conf_Server[i].lasttry = time_now; - - /* Search free connection structure */ - for( idx = 0; idx < Pool_Size; idx++ ) if( My_Connections[idx].sock == NONE ) break; - if (idx >= Pool_Size) { - Log( LOG_ALERT, "Can't establist server connection: connection limit reached (%d)!", - Pool_Size ); - return; - } -#ifdef DEBUG - Log( LOG_DEBUG, "Preparing connection %d for \"%s\" ...", idx, Conf_Server[i].host ); -#endif - - Init_Conn_Struct( idx ); - My_Connections[idx].sock = SERVER_WAIT; - Conf_Server[i].conn_id = idx; - - /* Resolve Hostname. If this fails, try to use it as an IP address */ - strlcpy( Conf_Server[i].ip, Conf_Server[i].host, sizeof( Conf_Server[i].ip )); - strlcpy( My_Connections[idx].host, Conf_Server[i].host, sizeof( My_Connections[idx].host )); - - assert(Resolve_Getfd(&My_Connections[idx].res_stat) < 0); - - Resolve_Name(&My_Connections[idx].res_stat, Conf_Server[i].host, cb_Read_Resolver_Result); + Conf_Server[i].conn_id = SERVER_WAIT; + assert(Proc_GetPipeFd(&Conf_Server[i].res_stat) < 0); + Resolve_Name(&Conf_Server[i].res_stat, Conf_Server[i].host, + cb_Connect_to_Server); } } /* Check_Servers */ - +/** + * Establish a new outgoing server connection. + * + * @param Server Configuration index of the server. + * @param dest Destination IP address to connect to. + */ static void -New_Server( int Server, CONN_ID Idx ) +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 ); - assert( Idx > NONE ); - Log( LOG_INFO, "Establishing connection to \"%s\", %s, port %d ... ", Conf_Server[Server].host, - Conf_Server[Server].ip, Conf_Server[Server].port ); + /* Make sure that the remote server hasn't re-linked to this server + * asynchronously on its own */ + if (Conf_Server[Server].conn_id > NONE) { + Log(LOG_INFO, + "Connection to \"%s\" meanwhile re-established, aborting preparation."); + return; + } -#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 - { - /* Can't convert IP address */ - Log( LOG_ERR, "Can't connect to \"%s\" (connection %d): can't convert ip address %s!", Conf_Server[Server].host, Idx, Conf_Server[Server].ip ); - goto out; + if (!ng_ipaddr_tostr_r(dest, ip_str)) { + Log(LOG_WARNING, "New_Server: Could not convert IP to string"); + Conf_Server[Server].conn_id = NONE; + return; } - memset( &new_addr, 0, sizeof( new_addr )); - new_addr.sin_family = AF_INET; - new_addr.sin_addr = inaddr; - new_addr.sin_port = htons( Conf_Server[Server].port ); + af_dest = ng_ipaddr_af(dest); + new_sock = socket(af_dest, SOCK_STREAM, 0); - new_sock = socket( PF_INET, SOCK_STREAM, 0 ); - if ( new_sock < 0 ) { - /* Can't create socket */ - Log( LOG_CRIT, "Can't create socket: %s!", strerror( errno )); - goto out; + Log(LOG_INFO, + "Establishing connection for \"%s\" to \"%s:%d\" (%s), socket %d ...", + Conf_Server[Server].name, Conf_Server[Server].host, + Conf_Server[Server].port, ip_str, new_sock); + + if (new_sock < 0) { + Log(LOG_CRIT, "Can't create socket (af %d): %s!", + af_dest, strerror(errno)); + Conf_Server[Server].conn_id = NONE; + return; } - if( ! Init_Socket( new_sock )) return; + if (!Init_Socket(new_sock)) { + Conf_Server[Server].conn_id = NONE; + return; + } - res = connect( new_sock, (struct sockaddr *)&new_addr, 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 )) { - /* Can't connect socket */ Log( LOG_CRIT, "Can't connect socket: %s!", strerror( errno )); close( new_sock ); - goto out; + Conf_Server[Server].conn_id = NONE; + return; } - /* Client-Struktur initialisieren */ - c = Client_NewLocal( Idx, inet_ntoa( new_addr.sin_addr ), CLIENT_UNKNOWNSERVER, false ); - if( ! c ) { - /* Can't create new client structure */ - Log( LOG_ALERT, "Can't establish connection: can't create client structure!" ); + if (!array_alloc(&My_ConnArray, sizeof(CONNECTION), (size_t)new_sock)) { + Log(LOG_ALERT, + "Cannot allocate memory for server connection (socket %d)", + new_sock); close( new_sock ); - goto out; + Conf_Server[Server].conn_id = NONE; + return; } + if (!io_event_create( new_sock, IO_WANTWRITE, cb_connserver)) { + Log(LOG_ALERT, "io_event_create(): could not add fd %d", + strerror(errno)); + close(new_sock); + Conf_Server[Server].conn_id = NONE; + return; + } + + My_Connections = array_start(&My_ConnArray); + + assert(My_Connections[new_sock].sock <= 0); + + Init_Conn_Struct(new_sock); + + 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!" ); + io_close(new_sock); + Conf_Server[Server].conn_id = NONE; + return; + } + + /* Conn_Close() decrements this counter again */ + Account_Connection(); Client_SetIntroducer( c, c ); Client_SetToken( c, TOKEN_OUTBOUND ); /* Register connection */ - My_Connections[Idx].sock = new_sock; - My_Connections[Idx].addr = new_addr; - strlcpy( My_Connections[Idx].host, Conf_Server[Server].host, sizeof( My_Connections[Idx].host )); - - /* Register new socket */ - if (!io_event_create( new_sock, IO_WANTWRITE, cb_connserver)) { - Log( LOG_ALERT, "io_event_create(): could not add fd %d", strerror(errno)); - Conn_Close( Idx, "io_event_create() failed", NULL, false ); - goto out; + if (!Conf_SetServer(Server, new_sock)) + return; + My_Connections[new_sock].sock = new_sock; + 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 )); + +#ifdef SSL_SUPPORT + if (Conf_Server[Server].SSLConnect && + !ConnSSL_PrepareConnect(&My_Connections[new_sock], &Conf_Server[Server])) + { + Log(LOG_ALERT, "Could not initialize SSL for outgoing connection"); + Conn_Close(new_sock, "Could not initialize SSL for outgoing connection", + NULL, false); + Init_Conn_Struct(new_sock); + Conf_Server[Server].conn_id = NONE; + return; } - -#ifdef DEBUG - Log( LOG_DEBUG, "Registered new connection %d on socket %d.", Idx, My_Connections[Idx].sock ); #endif - Conn_OPTION_ADD( &My_Connections[Idx], CONN_ISCONNECTING ); - return; -out: - Init_Conn_Struct( Idx ); - Conf_Server[Server].conn_id = NONE; + LogDebug("Registered new connection %d on socket %d (%ld in total).", + new_sock, My_Connections[new_sock].sock, NumConnections); + Conn_OPTION_ADD( &My_Connections[new_sock], CONN_ISCONNECTING ); } /* New_Server */ - +/** + * Initialize connection structure. + * + * @param Idx Connection index. + */ 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 )); - My_Connections[Idx].sock = NONE; + 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); -} /* Init_Conn_Struct */ + Proc_InitStruct(&My_Connections[Idx].proc_stat); +#ifdef ICONV + My_Connections[Idx].iconv_from = (iconv_t)(-1); + My_Connections[Idx].iconv_to = (iconv_t)(-1); +#endif +} /* Init_Conn_Struct */ +/** + * Initialize options of a new socket. + * + * For example, we try to set socket options SO_REUSEADDR and IPTOS_LOWDELAY. + * The socket is automatically closed if a fatal error is encountered. + * + * @param Sock Socket handle. + * @returns false if socket was closed due to fatal error. + */ static bool Init_Socket( int Sock ) { - /* Initialize socket (set options) */ - int value; if (!io_setnonblock(Sock)) { - Log( LOG_CRIT, "Can't enable non-blocking mode for socket: %s!", strerror( errno )); - close( Sock ); + Log(LOG_CRIT, "Can't enable non-blocking mode for socket: %s!", + strerror(errno)); + close(Sock); return false; } /* Don't block this port after socket shutdown */ value = 1; - if( setsockopt( Sock, SOL_SOCKET, SO_REUSEADDR, &value, (socklen_t)sizeof( value )) != 0 ) - { - Log( LOG_ERR, "Can't set socket option SO_REUSEADDR: %s!", strerror( errno )); + if (setsockopt(Sock, SOL_SOCKET, SO_REUSEADDR, &value, + (socklen_t)sizeof(value)) != 0) { + Log(LOG_ERR, "Can't set socket option SO_REUSEADDR: %s!", + strerror(errno)); /* ignore this error */ } /* Set type of service (TOS) */ -#if defined(IP_TOS) && defined(IPTOS_LOWDELAY) +#if defined(IPPROTO_IP) && defined(IPTOS_LOWDELAY) value = IPTOS_LOWDELAY; -#ifdef DEBUG - Log( LOG_DEBUG, "Setting option IP_TOS on socket %d to IPTOS_LOWDELAY (%d).", Sock, value ); -#endif - if( setsockopt( Sock, SOL_IP, IP_TOS, &value, (socklen_t)sizeof( value )) != 0 ) - { - Log( LOG_ERR, "Can't set socket option IP_TOS: %s!", strerror( errno )); + if (setsockopt(Sock, IPPROTO_IP, IP_TOS, &value, + (socklen_t) sizeof(value))) { + LogDebug("Can't set socket option IP_TOS: %s!", + strerror(errno)); /* ignore this error */ - } + } else + LogDebug("IP_TOS on socket %d has been set to IPTOS_LOWDELAY.", + Sock); #endif return true; } /* Init_Socket */ +/** + * Read results of a resolver sub-process and try to initiate a new server + * connection. + * + * @param fd File descriptor of the pipe to the sub-process. + * @param events (ignored IO specification) + */ +static void +cb_Connect_to_Server(int fd, UNUSED short events) +{ + int i; + size_t len; + + /* we can handle at most 3 addresses; but we read up to 4 so we can + * log the 'more than we can handle' condition. First result is tried + * immediately, rest is saved for later if needed. */ + ng_ipaddr_t dest_addrs[4]; + LogDebug("Resolver: Got forward lookup callback on fd %d, events %d", + fd, events); + + for (i=0; i < MAX_SERVERS; i++) { + if (Proc_GetPipeFd(&Conf_Server[i].res_stat) == fd ) + break; + } + + if( i >= MAX_SERVERS) { + /* Ops, no matching server found?! */ + io_close( fd ); + LogDebug("Resolver: Got Forward Lookup callback for unknown server!?"); + return; + } + + /* Read result from pipe */ + len = Proc_Read(&Conf_Server[i].res_stat, dest_addrs, sizeof(dest_addrs)); + Proc_Close(&Conf_Server[i].res_stat); + if (len == 0) { + /* Error resolving hostname: reset server structure */ + Conf_Server[i].conn_id = NONE; + return; + } + + 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, dest_addrs); +} /* cb_Read_Forward_Lookup */ + +/** + * Read results of a resolver sub-process from the pipe and update the + * appropriate connection/client structure(s): hostname and/or IDENT user name. + * + * @param r_fd File descriptor of the pipe to the sub-process. + * @param events (ignored IO specification) + */ static void cb_Read_Resolver_Result( int r_fd, UNUSED short events ) { - /* Read result of resolver sub-process from pipe and update the - * apropriate connection/client structure(s): hostname and/or - * IDENT user name.*/ - CLIENT *c; - int i, n; + CONN_ID i; size_t len; char *identptr; #ifdef IDENTAUTH char readbuf[HOST_LEN + 2 + CLIENT_USER_LEN]; + char *ptr; #else char readbuf[HOST_LEN + 1]; #endif -#ifdef DEBUG - Log( LOG_DEBUG, "Resolver: Got callback on fd %d, events %d", r_fd, events ); -#endif - - /* Search associated connection ... */ - for( i = 0; i < Pool_Size; i++ ) { - if(( My_Connections[i].sock != NONE ) - && ( Resolve_Getfd(&My_Connections[i].res_stat) == r_fd )) - break; - } - if( i >= Pool_Size ) { + LogDebug("Resolver: Got callback on fd %d, events %d", r_fd, events ); + i = Conn_GetFromProc(r_fd); + if (i == NONE) { /* Ops, none found? Probably the connection has already * been closed!? We'll ignore that ... */ io_close( r_fd ); -#ifdef DEBUG - Log( LOG_DEBUG, "Resolver: Got callback for unknown connection!?" ); -#endif + LogDebug("Resolver: Got callback for unknown connection!?"); return; } /* Read result from pipe */ - len = Resolve_Read(&My_Connections[i].res_stat, readbuf, sizeof readbuf -1); - if (len == 0) + len = Proc_Read(&My_Connections[i].proc_stat, readbuf, sizeof readbuf -1); + Proc_Close(&My_Connections[i].proc_stat); + if (len == 0) return; readbuf[len] = '\0'; @@ -1572,78 +2248,446 @@ cb_Read_Resolver_Result( int r_fd, UNUSED short events ) } *identptr = '\0'; -#ifdef DEBUG - Log( LOG_DEBUG, "Got result from resolver: \"%s\" (%u bytes read).", readbuf, len); -#endif + LogDebug("Got result from resolver: \"%s\" (%u bytes read).", readbuf, len); /* Okay, we got a complete result: this is a host name for outgoing * connections and a host name and IDENT user name (if enabled) for * incoming connections.*/ - if( My_Connections[i].sock > NONE ) { - /* Incoming connection. Search client ... */ - c = Client_GetFromConn( i ); - assert( c != NULL ); - - /* Only update client information of unregistered clients */ - if( Client_Type( c ) == CLIENT_UNKNOWN ) { - strlcpy(My_Connections[i].host, readbuf, sizeof( My_Connections[i].host)); - Client_SetHostname( c, readbuf); + assert ( My_Connections[i].sock >= 0 ); + /* Incoming connection. Search client ... */ + c = Conn_GetClient( i ); + assert( c != NULL ); + + /* Only update client information of unregistered clients. + * Note: user commands (e. g. WEBIRC) are always read _after_ reading + * the resolver results, so we don't have to worry to override settings + * from these commands here. */ + if(Client_Type(c) == CLIENT_UNKNOWN) { + strlcpy(My_Connections[i].host, readbuf, + sizeof(My_Connections[i].host)); + Client_SetHostname(c, readbuf); + if (Conf_NoticeAuth) + (void)Conn_WriteStr(i, + "NOTICE AUTH :*** Found your hostname: %s", + My_Connections[i].host); #ifdef IDENTAUTH - ++identptr; - if (*identptr) { - Log( LOG_INFO, "IDENT lookup for connection %ld: \"%s\".", i, identptr); - Client_SetUser( c, identptr, true ); + ++identptr; + if (*identptr) { + ptr = identptr; + while (*ptr) { + if ((*ptr < '0' || *ptr > '9') && + (*ptr < 'A' || *ptr > 'Z') && + (*ptr < 'a' || *ptr > 'z')) + break; + ptr++; + } + if (*ptr) { + /* Erroneous IDENT reply */ + Log(LOG_NOTICE, + "Got invalid IDENT reply for connection %d! Ignored.", + i); } else { - Log( LOG_INFO, "IDENT lookup for connection %ld: no result.", i ); + Log(LOG_INFO, + "IDENT lookup for connection %d: \"%s\".", + i, identptr); + Client_SetUser(c, identptr, true); } + if (Conf_NoticeAuth) { + (void)Conn_WriteStr(i, + "NOTICE AUTH :*** Got %sident response%s%s", + *ptr ? "invalid " : "", + *ptr ? "" : ": ", + *ptr ? "" : identptr); + } + } else if(Conf_Ident) { + Log(LOG_INFO, "IDENT lookup for connection %d: no result.", i); + if (Conf_NoticeAuth) + (void)Conn_WriteStr(i, + "NOTICE AUTH :*** No ident response"); + } #endif + + if (Conf_NoticeAuth) { + /* Send buffered data to the client, but break on + * errors because Handle_Write() would have closed + * the connection again in this case! */ + if (!Handle_Write(i)) + return; } + + Class_HandleServerBans(c); + } #ifdef DEBUG - else Log( LOG_DEBUG, "Resolver: discarding result for already registered connection %d.", i ); + else + LogDebug("Resolver: discarding result for already registered connection %d.", i); #endif - } else { - /* Outgoing connection (server link): set the IP address - * so that we can connect to it in the main loop. */ +} /* cb_Read_Resolver_Result */ - /* Search server ... */ - n = Conf_GetServer( i ); - assert( n > NONE ); +/** + * Write a "simple" (error) message to a socket. + * + * The message is sent without using the connection write buffers, without + * compression/encryption, and even without any error reporting. It is + * designed for error messages of e.g. New_Connection(). + * + * @param Sock Socket handle. + * @param Msg Message string to send. + */ +static void +Simple_Message(int Sock, const char *Msg) +{ + char buf[COMMAND_LEN]; + size_t len; - strlcpy( Conf_Server[n].ip, readbuf, sizeof( Conf_Server[n].ip )); + assert(Sock > NONE); + assert(Msg != NULL); + + strlcpy(buf, Msg, sizeof buf - 2); + len = strlcat(buf, "\r\n", sizeof buf); + if (write(Sock, buf, len) < 0) { + /* Because this function most probably got called to log + * an error message, any write error is ignored here to + * avoid an endless loop. But casting the result of write() + * to "void" doesn't satisfy the GNU C code attribute + * "warn_unused_result" which is used by some versions of + * glibc (e.g. 2.11.1), therefore this silly error + * "handling" code here :-( */ + return; } +} /* Simple_Error */ - /* Reset penalty time */ - Conn_ResetPenalty( i ); -} /* cb_Read_Resolver_Result */ +/** + * Get CLIENT structure that belongs to a local connection identified by its + * index number. Each connection belongs to a client by definition, so it is + * not required that the caller checks for NULL return values. + * + * @param Idx Connection index number. + * @returns Pointer to CLIENT structure. + */ +GLOBAL CLIENT * +Conn_GetClient( CONN_ID Idx ) +{ + CONNECTION *c; + + assert(Idx >= 0); + c = array_get(&My_ConnArray, sizeof (CONNECTION), (size_t)Idx); + assert(c != NULL); + return c ? c->client : NULL; +} + +/** + * Get PROC_STAT sub-process structure of a connection. + * + * @param Idx Connection index number. + * @returns PROC_STAT structure. + */ +GLOBAL PROC_STAT * +Conn_GetProcStat(CONN_ID Idx) +{ + CONNECTION *c; + assert(Idx >= 0); + c = array_get(&My_ConnArray, sizeof (CONNECTION), (size_t)Idx); + assert(c != NULL); + return &c->proc_stat; +} /* Conn_GetProcStat */ + +/** + * Get CONN_ID from file descriptor associated to a subprocess structure. + * + * @param fd File descriptor. + * @returns CONN_ID or NONE (-1). + */ +GLOBAL CONN_ID +Conn_GetFromProc(int fd) +{ + int i; + + assert(fd > 0); + for (i = 0; i < Pool_Size; i++) { + if ((My_Connections[i].sock != NONE) + && (Proc_GetPipeFd(&My_Connections[i].proc_stat) == fd)) + return i; + } + return NONE; +} /* Conn_GetFromProc */ +/** + * Throttle a connection because of excessive usage. + * + * @param Reason The reason, see THROTTLE_xxx constants. + * @param Idx The connection index. + * @param Client The client of this connection. + * @param Seconds The time to delay this connection. + */ static void -Simple_Message( int Sock, char *Msg ) +Throttle_Connection(const CONN_ID Idx, CLIENT *Client, const int Reason, + unsigned int Value) { - char buf[COMMAND_LEN]; - /* Write "simple" message to socket, without using compression - * or even the connection write buffers. Used e.g. for error - * messages by New_Connection(). */ - assert( Sock > NONE ); - assert( Msg != NULL ); - - strlcpy( buf, Msg, sizeof buf - 2); - strlcat( buf, "\r\n", sizeof buf); - (void)write( Sock, buf, strlen( buf ) ); -} /* Simple_Error */ + assert(Idx > NONE); + assert(Client != NULL); + /* Never throttle servers or services, only interrupt processing */ + if (Client_Type(Client) == CLIENT_SERVER + || Client_Type(Client) == CLIENT_UNKNOWNSERVER + || Client_Type(Client) == CLIENT_SERVICE) + return; -static int -Count_Connections( struct sockaddr_in addr_in ) + /* Don't throttle clients with user mode 'F' set */ + if (Client_HasMode(Client, 'F')) + return; + + LogDebug("Throttling connection %d: code %d, value %d!", Idx, + Reason, Value); + Conn_SetPenalty(Idx, 1); +} + +#ifndef STRICT_RFC + +GLOBAL long +Conn_GetAuthPing(CONN_ID Idx) { - 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++; + assert (Idx != NONE); + return My_Connections[Idx].auth_ping; +} /* Conn_GetAuthPing */ + +GLOBAL void +Conn_SetAuthPing(CONN_ID Idx, long ID) +{ + assert (Idx != NONE); + My_Connections[Idx].auth_ping = ID; +} /* Conn_SetAuthPing */ + +#endif /* STRICT_RFC */ + +#ifdef SSL_SUPPORT + +/** + * IO callback for new SSL-enabled client and server connections. + * + * @param sock Socket descriptor. + * @param what IO specification (IO_WANTREAD/IO_WANTWRITE/...). + */ +static void +cb_clientserver_ssl(int sock, UNUSED short what) +{ + CONN_ID idx = Socket2Index(sock); + + assert(idx >= 0); + + if (idx < 0) { + io_close(sock); + return; + } + + switch (ConnSSL_Accept(&My_Connections[idx])) { + case 1: + break; /* OK */ + case 0: + return; /* EAGAIN: callback will be invoked again by IO layer */ + default: + Conn_Close(idx, + "SSL accept error, closing socket", "SSL accept error", + false); + return; + } + + io_event_setcb(sock, cb_clientserver); /* SSL handshake completed */ +} + +/** + * IO callback for listening SSL sockets: handle new connections. This callback + * gets called when a new SSL-enabled connection should be accepted. + * + * @param sock Socket descriptor. + * @param irrelevant (ignored IO specification) + */ +static void +cb_listen_ssl(int sock, short irrelevant) +{ + int fd; + + (void) irrelevant; + fd = New_Connection(sock, true); + if (fd < 0) + return; + io_event_setcb(My_Connections[fd].sock, cb_clientserver_ssl); +} + +/** + * IO callback for new outgoing SSL-enabled server connections. + * + * @param sock Socket descriptor. + * @param unused (ignored IO specification) + */ +static void +cb_connserver_login_ssl(int sock, short unused) +{ + CONN_ID idx = Socket2Index(sock); + + assert(idx >= 0); + if (idx < 0) { + io_close(sock); + return; + } + (void) unused; + switch (ConnSSL_Connect( &My_Connections[idx])) { + case 1: break; + case 0: LogDebug("ConnSSL_Connect: not ready"); + return; + case -1: + Log(LOG_ERR, "SSL connection on socket %d failed!", sock); + Conn_Close(idx, "Can't connect", NULL, false); + return; } - return cnt; -} /* Count_Connections */ + Log( LOG_INFO, "SSL connection %d with \"%s:%d\" established.", idx, + My_Connections[idx].host, Conf_Server[Conf_GetServer( idx )].port ); + + server_login(idx); +} + + +/** + * Check if SSL library needs to read SSL-protocol related data. + * + * SSL/TLS connections require extra treatment: + * When either CONN_SSL_WANT_WRITE or CONN_SSL_WANT_READ is set, we + * need to take care of that first, before checking read/write buffers. + * For instance, while we might have data in our write buffer, the + * TLS/SSL protocol might need to read internal data first for TLS/SSL + * writes to succeed. + * + * If this function returns true, such a condition is met and we have + * to reverse the condition (check for read even if we've data to write, + * do not check for read but writeability even if write-buffer is empty). + * + * @param c Connection to check. + * @returns true if SSL-library has to read protocol data. + */ +static bool +SSL_WantRead(const CONNECTION *c) +{ + if (Conn_OPTION_ISSET(c, CONN_SSL_WANT_READ)) { + io_event_add(c->sock, IO_WANTREAD); + return true; + } + return false; +} +/** + * Check if SSL library needs to write SSL-protocol related data. + * + * Please see description of SSL_WantRead() for full description! + * + * @param c Connection to check. + * @returns true if SSL-library has to write protocol data. + */ +static bool +SSL_WantWrite(const CONNECTION *c) +{ + if (Conn_OPTION_ISSET(c, CONN_SSL_WANT_WRITE)) { + io_event_add(c->sock, IO_WANTWRITE); + return true; + } + return false; +} + +/** + * Get information about used SSL cipher. + * + * @param Idx Connection index number. + * @param buf Buffer for returned information text. + * @param len Size of return buffer "buf". + * @returns true on success, false otherwise. + */ +GLOBAL bool +Conn_GetCipherInfo(CONN_ID Idx, char *buf, size_t len) +{ + if (Idx < 0) + return false; + assert(Idx < (int) array_length(&My_ConnArray, sizeof(CONNECTION))); + return ConnSSL_GetCipherInfo(&My_Connections[Idx], buf, len); +} + +/** + * Check if a connection is SSL-enabled or not. + * + * @param Idx Connection index number. + * @return true if connection is SSL-enabled, false otherwise. + */ +GLOBAL bool +Conn_UsesSSL(CONN_ID Idx) +{ + if (Idx < 0) + return false; + assert(Idx < (int) array_length(&My_ConnArray, sizeof(CONNECTION))); + return Conn_OPTION_ISSET(&My_Connections[Idx], CONN_SSL); +} + +GLOBAL char * +Conn_GetCertFp(CONN_ID Idx) +{ + if (Idx < 0) + return NULL; + assert(Idx < (int) array_length(&My_ConnArray, sizeof(CONNECTION))); + return ConnSSL_GetCertFp(&My_Connections[Idx]); +} + +GLOBAL bool +Conn_SetCertFp(CONN_ID Idx, const char *fingerprint) +{ + if (Idx < 0) + return false; + assert(Idx < (int) array_length(&My_ConnArray, sizeof(CONNECTION))); + return ConnSSL_SetCertFp(&My_Connections[Idx], fingerprint); +} + +#else /* SSL_SUPPORT */ + +GLOBAL bool +Conn_UsesSSL(UNUSED CONN_ID Idx) +{ + return false; +} + +GLOBAL char * +Conn_GetCertFp(UNUSED CONN_ID Idx) +{ + return NULL; +} + +GLOBAL bool +Conn_SetCertFp(UNUSED CONN_ID Idx, UNUSED const char *fingerprint) +{ + return true; +} + +#endif /* SSL_SUPPORT */ + +#ifdef DEBUG + +/** + * Dump internal state of the "connection module". + */ +GLOBAL void +Conn_DebugDump(void) +{ + int i; + + Log(LOG_DEBUG, "Connection status:"); + for (i = 0; i < Pool_Size; i++) { + if (My_Connections[i].sock == NONE) + continue; + Log(LOG_DEBUG, + " - %d: host=%s, lastdata=%ld, lastping=%ld, delaytime=%ld, flag=%d, options=%d, bps=%d, client=%s", + My_Connections[i].sock, My_Connections[i].host, + My_Connections[i].lastdata, My_Connections[i].lastping, + My_Connections[i].delaytime, My_Connections[i].flag, + My_Connections[i].options, My_Connections[i].bps, + My_Connections[i].client ? Client_ID(My_Connections[i].client) : "-"); + } +} /* Conn_DumpClients */ + +#endif /* DEBUG */ /* -eof- */