socket_libc.inl

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/** @file
 *  @author Bram de Greve (bramz@users.sourceforge.net)
 *  @author Tom De Muer (tomdemuer@users.sourceforge.net)
 *
 *  *** BEGIN LICENSE INFORMATION ***
 *  
 *  The contents of this file are subject to the Common Public Attribution License 
 *  Version 1.0 (the "License"); you may not use this file except in compliance with 
 *  the License. You may obtain a copy of the License at 
 *  http://lass.sourceforge.net/cpal-license. The License is based on the 
 *  Mozilla Public License Version 1.1 but Sections 14 and 15 have been added to cover 
 *  use of software over a computer network and provide for limited attribution for 
 *  the Original Developer. In addition, Exhibit A has been modified to be consistent 
 *  with Exhibit B.
 *  
 *  Software distributed under the License is distributed on an "AS IS" basis, WITHOUT 
 *  WARRANTY OF ANY KIND, either express or implied. See the License for the specific 
 *  language governing rights and limitations under the License.
 *  
 *  The Original Code is LASS - Library of Assembled Shared Sources.
 *  
 *  The Initial Developer of the Original Code is Bram de Greve and Tom De Muer.
 *  The Original Developer is the Initial Developer.
 *  
 *  All portions of the code written by the Initial Developer are:
 *  Copyright (C) 2004-2007 the Initial Developer.
 *  All Rights Reserved.
 *  
 *  Contributor(s):
 *
 *  Alternatively, the contents of this file may be used under the terms of the 
 *  GNU General Public License Version 2 or later (the GPL), in which case the 
 *  provisions of GPL are applicable instead of those above.  If you wish to allow use
 *  of your version of this file only under the terms of the GPL and not to allow 
 *  others to use your version of this file under the CPAL, indicate your decision by 
 *  deleting the provisions above and replace them with the notice and other 
 *  provisions required by the GPL License. If you do not delete the provisions above,
 *  a recipient may use your version of this file under either the CPAL or the GPL.
 *  
 *  *** END LICENSE INFORMATION ***
 */

#include "../io_common.h"
#include "../socket.h"
#include "../../util/impl/lass_errno.h"
#include <sys/socket.h>
#include <sys/types.h>
#include <netinet/in.h>
#include <netdb.h>
#include <unistd.h>

namespace lass
{
namespace io
{
namespace impl
{

class SocketImpl: public util::NonCopyable
{
public:

    SocketImpl():
        socket_(invalidSocket)
    {
    }

    ~SocketImpl()
    {
        try
        {
            closeSocket();
        }
        catch (std::exception& error)
        {
            std::cerr << "[LASS RUN MSG] WARNING: closeSocket() failed: " << error.what();
        }
    }

    void bind(unsigned short portNumber)
    {
        openSocket();

        ::sockaddr_in addr;
        addr.sin_addr.s_addr = htonl(INADDR_ANY);
        addr.sin_family = AF_INET;
        addr.sin_port = htons(portNumber);

        if (::bind(socket_, reinterpret_cast<sockaddr*>(&addr), sizeof(addr)) != 0)
        {
            const int err = util::impl::lass_errno();
            LASS_THROW_EX(SocketError, "Failed to bind socket to port " << portNumber 
                << ": " << util::impl::lass_strerror(err));
        }
    }

    void listen()
    {
        LASS_ASSERT(socket_ != invalidSocket);
        if (::listen(socket_, SOMAXCONN) != 0)
        {
            const int err = util::impl::lass_errno();
            LASS_THROW_EX(SocketError, "Failed to listen: " << util::impl::lass_strerror(err));
        }
    }

    void accept(SocketImpl* connection)
    {
        LASS_ASSERT(socket_ != invalidSocket);
        int socket = ::accept(socket_, 0, 0);
        if (socket == invalidSocket)
        {
            const int err = util::impl::lass_errno();
            LASS_THROW_EX(SocketError, "Failed to accept connection: " << util::impl::lass_strerror(err));
        }
        LASS_ASSERT(connection);
        connection->socket_ = socket;
    }

    void connect(const std::string& ipAddress, unsigned short portNumber)
    {
        openSocket();
        
        ::hostent* other = gethostbyname(ipAddress.c_str());
        if (!other)
        {
            LASS_THROW_EX(SocketError, "could not connect " << ipAddress << ":" << portNumber
                << " : failed to lookup hostname.");
        }       

        sockaddr_in dest;
        dest.sin_addr = *(in_addr*) other->h_addr;
        dest.sin_family = PF_INET;
        dest.sin_port = htons(portNumber);
        const int ret = ::connect(socket_, reinterpret_cast<sockaddr*>(&dest), sizeof(dest));
        if (ret != 0)
        {
            const int err = util::impl::lass_errno();
            LASS_THROW_EX(SocketError, "Could not connect " << ipAddress << ":" << portNumber 
                << " : " << util::impl::lass_strerror(err));
        }
    }

    const int send(const void* begin, int length)
    {
        LASS_ASSERT(socket_ != invalidSocket);
        const int ret = ::send(socket_, static_cast<const char*>(begin), length, 0);
        if (ret == -1)
        {
            const int err = util::impl::lass_errno();
            LASS_THROW_EX(SocketError, "Failed to send data: " << util::impl::lass_strerror(err));
        }
        LASS_ASSERT(ret >= 0);
        return ret;
    }

    const int receive(void* begin, int length)
    {
        const int ret = ::recv(socket_, static_cast<char*>(begin), length, 0);
        if (ret == -1)
        {
            const int err = util::impl::lass_errno();
            LASS_THROW_EX(SocketError, "Failed to receive data: " << util::impl::lass_strerror(err));
        }
        LASS_ASSERT(ret >= 0);
        return ret;
    }

private:

    enum { invalidSocket = -1 };

    void openSocket()
    {
        if (socket_ == invalidSocket)
        {
            socket_ = socket(AF_INET, SOCK_STREAM, 0);
            if (socket_ == invalidSocket)
            {
                const int err = util::impl::lass_errno();
                LASS_THROW_EX(SocketError, "Failed to create socket: " << util::impl::lass_strerror(err));
            }
        }
    }
    
    void closeSocket()
    {
        if (socket_ != invalidSocket)
        {
            const int ret = close(socket_);
            socket_ = invalidSocket;
            if (ret != 0)
            {
                const int err = util::impl::lass_errno();
                LASS_THROW_EX(SocketError, "Failed to close socket: " << util::impl::lass_strerror(err));
            } 
        }
    }

    int socket_;
};

}
}
}

// EOF