static int sd_accept(t_addr const * curr_laddr, t_laddr_info const * laddr_info, int ssocket, int usocket) { char tempa[32]; int csocket; struct sockaddr_in caddr; psock_t_socklen caddr_len; unsigned int raddr; unsigned short rport; if (!addr_get_addr_str(curr_laddr,tempa,sizeof(tempa))) strcpy(tempa,"x.x.x.x:x"); /* accept the connection */ memset(&caddr,0,sizeof(caddr)); /* not sure if this is needed... modern systems are ok anyway */ caddr_len = sizeof(caddr); if ((csocket = psock_accept(ssocket,(struct sockaddr *)&caddr,&caddr_len))<0) { /* BSD, POSIX error for aborted connections, SYSV often uses EAGAIN or EPROTO */ if ( #ifdef PSOCK_EWOULDBLOCK psock_errno()==PSOCK_EWOULDBLOCK || #endif #ifdef PSOCK_ECONNABORTED psock_errno()==PSOCK_ECONNABORTED || #endif #ifdef PSOCK_EPROTO psock_errno()==PSOCK_EPROTO || #endif 0) eventlog(eventlog_level_error,"sd_accept","client aborted connection on %s (psock_accept: %s)",tempa,strerror(psock_errno())); else /* EAGAIN can mean out of resources _or_ connection aborted :( */ if ( #ifdef PSOCK_EINTR psock_errno()!=PSOCK_EINTR && #endif 1) eventlog(eventlog_level_error,"sd_accept","could not accept new connection on %s (psock_accept: %s)",tempa,strerror(psock_errno())); return -1; } #ifdef HAVE_POLL if (csocket>=BNETD_MAX_SOCKETS) /* This check is a bit too strict (csocket is probably * greater than the number of connections) but this makes * life easier later. */ { eventlog(eventlog_level_error,"sd_accept","csocket is beyond range allowed by BNETD_MAX_SOCKETS for poll() (%d>=%d)",csocket,BNETD_MAX_SOCKETS); psock_close(csocket); return -1; } #else # ifdef FD_SETSIZE if (csocket>=FD_SETSIZE) /* fd_set size is determined at compile time */ { eventlog(eventlog_level_error,"sd_accept","csocket is beyond range allowed by FD_SETSIZE for select() (%d>=%d)",csocket,FD_SETSIZE); psock_close(csocket); return -1; } # endif #endif if (ipbanlist_check(inet_ntoa(caddr.sin_addr))!=0) { eventlog(eventlog_level_info,"sd_accept","[%d] connection from banned address %s denied (closing connection)",csocket,inet_ntoa(caddr.sin_addr)); psock_close(csocket); return -1; } eventlog(eventlog_level_info,"sd_accept","[%d] accepted connection from %s on %s",csocket,addr_num_to_addr_str(ntohl(caddr.sin_addr.s_addr),ntohs(caddr.sin_port)),tempa); if (prefs_get_use_keepalive()) { int val=1; if (psock_setsockopt(csocket,PSOCK_SOL_SOCKET,PSOCK_SO_KEEPALIVE,&val,(psock_t_socklen)sizeof(val))<0) eventlog(eventlog_level_error,"sd_accept","[%d] could not set socket option SO_KEEPALIVE (psock_setsockopt: %s)",csocket,strerror(psock_errno())); /* not a fatal error */ } { struct sockaddr_in rsaddr; psock_t_socklen rlen; memset(&rsaddr,0,sizeof(rsaddr)); /* not sure if this is needed... modern systems are ok anyway */ rlen = sizeof(rsaddr); if (psock_getsockname(csocket,(struct sockaddr *)&rsaddr,&rlen)<0) { eventlog(eventlog_level_error,"sd_accept","[%d] unable to determine real local port (psock_getsockname: %s)",csocket,strerror(psock_errno())); /* not a fatal error */ raddr = addr_get_ip(curr_laddr); rport = addr_get_port(curr_laddr); } else { if (rsaddr.sin_family!=PSOCK_AF_INET) { eventlog(eventlog_level_error,"sd_accept","local address returned with bad address family %d",(int)rsaddr.sin_family); /* not a fatal error */ raddr = addr_get_ip(curr_laddr); rport = addr_get_port(curr_laddr); } else { raddr = ntohl(rsaddr.sin_addr.s_addr); rport = ntohs(rsaddr.sin_port); } } } if (psock_ctl(csocket,PSOCK_NONBLOCK)<0) { eventlog(eventlog_level_error,"sd_accept","[%d] could not set TCP socket to non-blocking mode (closing connection) (psock_ctl: %s)",csocket,strerror(psock_errno())); psock_close(csocket); return -1; } { t_connection * c; if (!(c = conn_create(csocket,usocket,raddr,rport,addr_get_ip(curr_laddr),addr_get_port(curr_laddr),ntohl(caddr.sin_addr.s_addr),ntohs(caddr.sin_port)))) { eventlog(eventlog_level_error,"sd_accept","[%d] unable to create new connection (closing connection)",csocket); psock_close(csocket); return -1; } eventlog(eventlog_level_debug,"sd_accept","[%d] client connected to a %s listening address",csocket,laddr_type_get_str(laddr_info->type)); switch (laddr_info->type) { case laddr_type_irc: conn_set_class(c,conn_class_irc); conn_set_state(c,conn_state_connected); break; case laddr_type_telnet: conn_set_class(c,conn_class_telnet); conn_set_state(c,conn_state_connected); break; case laddr_type_bnet: default: /* We have to wait for an initial "magic" byte on bnet connections to * tell us exactly what connection class we are dealing with. */ break; } } return 0; }
extern int handle_init_packet(t_connection * c, t_packet const * const packet) { if (!c) { eventlog(eventlog_level_error,__FUNCTION__,"[%d] got NULL connection",conn_get_socket(c)); return -1; } if (!packet) { eventlog(eventlog_level_error,__FUNCTION__,"[%d] got NULL packet",conn_get_socket(c)); return -1; } switch (packet_get_type(packet)) { case MIRROR_GREET: if (packet_get_class(packet)!=packet_mirror_greet) { eventlog(eventlog_level_error,__FUNCTION__,"[%d] got bad packet (class %d)",conn_get_socket(c),(int)packet_get_class(packet)); return -1; } conn_set_addr(c, packet->u.mirror_greet.remote_addr); conn_set_port(c, packet->u.mirror_greet.remote_port); eventlog(eventlog_level_info,__FUNCTION__,"[%d] mirror greet detected for %s", conn_get_socket(c), addr_num_to_addr_str(conn_get_addr(c),conn_get_port(c))); conn_set_mirror(c, 2); if (ipbanlist_check(addr_num_to_ip_str(conn_get_addr(c)))!=0) { return -1; } if ((prefs_get_max_conns_per_IP()!=0) && (connlist_count_connections(conn_get_addr(c)) > prefs_get_max_conns_per_IP())) { return -1; } break; case CLIENT_INITCONN: if (packet_get_class(packet)!=packet_class_init) { eventlog(eventlog_level_error,__FUNCTION__,"[%d] got bad packet (class %d)",conn_get_socket(c),(int)packet_get_class(packet)); return -1; } switch (bn_byte_get(packet->u.client_initconn.class)) { case CLIENT_INITCONN_CLASS_BNET: eventlog(eventlog_level_info,__FUNCTION__,"[%d] client initiated bnet connection",conn_get_socket(c)); conn_set_state(c,conn_state_connected); conn_set_class(c,conn_class_bnet); break; case CLIENT_INITCONN_CLASS_FILE: eventlog(eventlog_level_info,__FUNCTION__,"[%d] client initiated file download connection",conn_get_socket(c)); conn_set_state(c,conn_state_connected); conn_set_class(c,conn_class_file); break; case CLIENT_INITCONN_CLASS_BOT: eventlog(eventlog_level_info,__FUNCTION__,"[%d] client initiated chat bot connection",conn_get_socket(c)); conn_set_state(c,conn_state_connected); conn_set_class(c,conn_class_bot); break; case CLIENT_INITCONN_CLASS_TELNET: eventlog(eventlog_level_info,__FUNCTION__,"[%d] client initiated telnet connection",conn_get_socket(c)); conn_set_state(c,conn_state_connected); conn_set_class(c,conn_class_telnet); break; case CLIENT_INITCONN_CLASS_D2CS_BNETD: { eventlog(eventlog_level_info,__FUNCTION__,"[%d] client initiated d2cs_bnetd connection",conn_get_socket(c)); if (!(realmlist_find_realm_by_ip(conn_get_addr(c)))) { eventlog(eventlog_level_info,__FUNCTION__, "[%d] d2cs connection from unknown ip address %s",conn_get_socket(c),addr_num_to_addr_str(conn_get_addr(c),conn_get_port(c))); return -1; } conn_set_state(c,conn_state_connected); conn_set_class(c,conn_class_d2cs_bnetd); if (handle_d2cs_init(c)<0) { eventlog(eventlog_level_info,__FUNCTION__,"faild to init d2cs connection"); return -1; } } break; case CLIENT_INITCONN_CLASS_ENC: eventlog(eventlog_level_info,__FUNCTION__,"[%d] client initiated encrypted connection (not supported)",conn_get_socket(c)); return -1; default: eventlog(eventlog_level_error,__FUNCTION__,"[%d] client requested unknown class 0x%02x (length %d) (closing connection)",conn_get_socket(c),(unsigned int)bn_byte_get(packet->u.client_initconn.class),packet_get_size(packet)); return -1; } break; default: eventlog(eventlog_level_error,__FUNCTION__,"[%d] unknown init packet type 0x%04x, len %u",conn_get_socket(c),packet_get_type(packet),packet_get_size(packet)); return -1; } return 0; }