SocketListener.cc

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00001 // SocketListener.cc
00002 
00003 // This file is part of bes, A C++ back-end server implementation framework
00004 // for the OPeNDAP Data Access Protocol.
00005 
00006 // Copyright (c) 2004-2009 University Corporation for Atmospheric Research
00007 // Author: Patrick West <pwest@ucar.edu> and Jose Garcia <jgarcia@ucar.edu>
00008 //
00009 // This library is free software; you can redistribute it and/or
00010 // modify it under the terms of the GNU Lesser General Public
00011 // License as published by the Free Software Foundation; either
00012 // version 2.1 of the License, or (at your option) any later version.
00013 // 
00014 // This library is distributed in the hope that it will be useful,
00015 // but WITHOUT ANY WARRANTY; without even the implied warranty of
00016 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00017 // Lesser General Public License for more details.
00018 // 
00019 // You should have received a copy of the GNU Lesser General Public
00020 // License along with this library; if not, write to the Free Software
00021 // Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
00022 //
00023 // You can contact University Corporation for Atmospheric Research at
00024 // 3080 Center Green Drive, Boulder, CO 80301
00025  
00026 // (c) COPYRIGHT University Corporation for Atmospheric Research 2004-2005
00027 // Please read the full copyright statement in the file COPYRIGHT_UCAR.
00028 //
00029 // Authors:
00030 //      pwest       Patrick West <pwest@ucar.edu>
00031 //      jgarcia     Jose Garcia <jgarcia@ucar.edu>
00032 
00033 #include <ctype.h>
00034 #include <sys/types.h>
00035 #include <sys/socket.h>
00036 
00037 #include <cstring>
00038 #include <cerrno>
00039 
00040 #include "SocketListener.h"
00041 #include "BESInternalError.h"
00042 #include "Socket.h"
00043 #include "SocketConfig.h"
00044 
00045 SocketListener::SocketListener()
00046     : _accepting( false )
00047 {
00048 }
00049 
00050 SocketListener::~SocketListener()
00051 {
00052 }
00053 
00054 void
00055 SocketListener::listen( Socket *s )
00056 {
00057     if( _accepting )
00058     {
00059         string err = (string)"Already accepting connections, "
00060                      + "no more sockets can be added" ;
00061         throw BESInternalError( err, __FILE__, __LINE__ ) ;
00062     }
00063 
00064     if( s && !s->isConnected() && !s->isListening() )
00065     {
00066         s->listen() ;
00067         _socket_list[s->getSocketDescriptor()] = s ;
00068     }
00069     else
00070     {
00071         if( !s )
00072         {
00073             throw BESInternalError( "null socket passed", __FILE__, __LINE__ ) ;
00074         }
00075         else if( s->isConnected() )
00076         {
00077             string err( "socket already connected, cannot listen" ) ;
00078             throw BESInternalError( err, __FILE__, __LINE__ ) ;
00079         }
00080         else if( s->isListening() )
00081         {
00082             string err( "socket already listening" ) ;
00083             throw BESInternalError( err, __FILE__, __LINE__ ) ;
00084         }
00085     }
00086 }
00087 
00089 Socket *
00090 SocketListener::accept()
00091 {
00092     int msgsock ;
00093 
00094     fd_set read_fd ;
00095     struct timeval timeout ;
00096 
00097     int maxfd ;
00098 
00099     for(;;)
00100     {
00101         timeout.tv_sec = 120 ;
00102         timeout.tv_usec = 0 ;
00103 
00104         FD_ZERO( &read_fd ) ;
00105 
00106         maxfd = 0 ;
00107         Socket_citer iter = _socket_list.begin() ;
00108         for( ; iter != _socket_list.end(); iter++ )
00109         {
00110             Socket *s_ptr = (*iter).second ;
00111             int s = s_ptr->getSocketDescriptor() ;
00112             if( s > maxfd ) maxfd = s ;
00113             FD_SET( s, &read_fd ) ;
00114         }
00115 
00116         if( select( maxfd+1, &read_fd,
00117                     (fd_set*)NULL, (fd_set*)NULL, &timeout) < 0 )
00118         {
00119             string err( "selecting sockets " ) ;
00120             const char *error_info = strerror( errno ) ;
00121             if( error_info )
00122                 err += " " + (string)error_info ;
00123             throw BESInternalError( err, __FILE__, __LINE__ ) ;
00124         }
00125 
00126         iter = _socket_list.begin() ;
00127         for( ; iter != _socket_list.end(); iter++ )
00128         {
00129             Socket *s_ptr = (*iter).second ;
00130             int s = s_ptr->getSocketDescriptor() ;
00131             if ( FD_ISSET( s, &read_fd ) )  
00132             {    
00133                 struct sockaddr from ;
00134                 int len_from = sizeof( from ) ;
00135 #ifdef _ACCEPT_USES_SOCKLEN_T 
00136                 msgsock = ::accept( s, (struct sockaddr *)&from,
00137                                     (socklen_t *)&len_from ) ;
00138 #else
00139                 msgsock = ::accept( s, (struct sockaddr *)&from,
00140                                     &len_from ) ;
00141 #endif
00142                 return s_ptr->newSocket( msgsock, (struct sockaddr *)&from );
00143             }
00144         }
00145     }
00146     return 0 ;
00147 }
00148 
00155 void
00156 SocketListener::dump( ostream &strm ) const
00157 {
00158     strm << BESIndent::LMarg << "SocketListener::dump - ("
00159                              << (void *)this << ")" << endl ;
00160     BESIndent::Indent() ;
00161     if( _socket_list.size() )
00162     {
00163         strm << BESIndent::LMarg << "registered sockets:" << endl ;
00164         Socket_citer i = _socket_list.begin() ;
00165         Socket_citer ie = _socket_list.end() ;
00166         for( ; i != ie; i++ )
00167         {
00168             strm << BESIndent::LMarg << "socket: " << (*i).first ;
00169             Socket *s_ptr = (*i).second ;
00170             s_ptr->dump( strm ) ;
00171         }
00172     }
00173     else
00174     {
00175         strm << BESIndent::LMarg << "registered sockets: none" << endl ;
00176     }
00177     BESIndent::UnIndent() ;
00178 }
00179 

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