File: SocketAddress.c

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/*
**      SWISH++
**      SocketAddress.c
**
**      Copyright (C) 2000  Paul J. Lucas
**
**      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.
**
**      This program is distributed in the hope that it will be useful,
**      but WITHOUT ANY WARRANTY; without even the implied warranty of
**      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
**      GNU General Public License for more details.
**
**      You should have received a copy of the GNU General Public License
**      along with this program; if not, write to the Free Software
**      Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/

// standard
#include <iostream>
#include <netdb.h>                              /* for gethostbyname(3), etc */
#include <sys/types.h>                          /* needed by FreeBSD systems */
#include <netinet/in.h>
#include <cstring>
#include <cstdlib>                              /* for atoi(3) */

// local
#include "exit_codes.h"
#include "platform.h"
#include "SocketAddress.h"

using namespace std;

//*****************************************************************************
//
// SYNOPSIS
//
        void SocketAddress::convert_host( char const *hostname_or_ip )
//
// DESCRIPTION
//
//      Parse either a hostname (foo.bar.com) or an IP address (123.45.67.89)
//      and convert it to a value suitable for use as an Internet address.  A
//      value of '*' means "any IP address."
//
// PARAMETERS
//
//      hostname_or_ip  The host name or IP address to be parsed.
//
// SEE ALSO
//
//      W. Richard Stevens.  "Unix Network Programming, Vol 1, 2nd ed."
//      Prentice-Hall, Upper Saddle River, NJ, 1998, section 9.3.
//
//*****************************************************************************
{
    if ( *hostname_or_ip == '*' ) {
        addr_.s_addr = htonl( INADDR_ANY );
        return;
    }

    struct hostent const *const host = ::gethostbyname( hostname_or_ip );
    if ( !host ) {
        error() << '"' << hostname_or_ip << "\" is invalid\n";
        ::exit( Exit_No_Host_or_IP );
    }

    //
    // The h_addr_list member is defined as "char**" even though it is really
    // "struct in_addr**" (this seems really brain damaged), so we have to do
    // an ugly cast.
    //
    addr_ = *reinterpret_cast<struct in_addr*>( host->h_addr_list[0] );
}

//*****************************************************************************
//
// SYNOPSIS
//
        void SocketAddress::parse_value( char *line )
//
// DESCRIPTION
//
//      Parse the IP address (maybe) and port number from the line of text.
//
// PARAMETERS
//
//      line    The line of text to be parsed.
//
//*****************************************************************************
{
    conf<string>::parse_value( line );
    char *const colon = ::strchr( line, ':' );
    if ( colon ) {
        *colon = '\0';
        convert_host( line );
        port_ = ::atoi( colon + 1 );
    } else
        port_ = ::atoi( line );

    if ( !port_ )
        ::exit( Exit_Config_File );
}
/* vim:set et sw=4 ts=4: */