lib/space/ethers.cc

Go to the documentation of this file.

//
// nis-util - NIS Administration Utilities
// Copyright (C) 2001, 2008, 2009, 2011, 2012 Peter Miller
//
// 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, see <http://www.gnu.org/licenses/>.
//

#include <lib/ac/string.h>

#include <lib/space/ethers.h>
#include <lib/space/hosts.h>


space_ethers::~space_ethers()
{
    discard_comments();
    discard_blank_lines();
}


space_ethers::space_ethers(const rcstring &a_filename) :
    space(a_filename)
{
    discard_comments();
    discard_blank_lines();
}


space_ethers::pointer
space_ethers::create(const rcstring &a_filename)
{
    return pointer(new space_ethers(a_filename));
}


space_ethers::record::pointer
space_ethers::get(void)
{
    for (;;)
    {
        source_location glocn;
        line_t line;
        if (!read_one_line(glocn, line))
        {
            last_rp.reset();
            return record::pointer();
        }
        if (line.size() < 2)
        {
            error
            (
                glocn,
                "too few fields (expected 2, received %ld)",
                (long)line.size()
            );
            continue;
        }
        if (line.size() > 2)
        {
            error
            (
                glocn,
                "too many fields (expected 2, received %ld)",
                (long)line.size()
            );
        }

        rcstring mac_address = line[0];
        rcstring name = line[1];
        rcstring ip_address;

        //
        // Check MAC address.
        //
        ether_addr *eap = ether_aton(mac_address.c_str());
        if (!eap)
        {
            error
            (
                glocn,
                "MAC address %s not valid",
                mac_address.quote_c().c_str()
            );
            continue;
        }

        rcstring temp(ether_ntoa(eap));
        if (temp != mac_address)
        {
            error
            (
                glocn,
                "MAC address %s not in correct format, use %s instead",
                mac_address.quote_c().c_str(),
                temp.quote_c().c_str()
            );
            mac_address = temp;
        }

        //
        // The second argument could be an IP address or a host name.
        //
        if (!space_hosts::valid_ip_address(name, temp))
        {
            //
            // Transfer host name.
            //
            if (!space_hosts::valid_host_name(name, temp))
            {
                error
                (
                    glocn,
                    "host name %s not valid, suggest %s instead",
                    name.quote_c().c_str(),
                    temp.quote_c().c_str()
                );
                name = temp;
            }
        }
        else
        {
            //
            // Transfer IP address.
            //
            ip_address = name;
            name = "";
            if (temp != ip_address)
            {
                error
                (
                    glocn,
                    "IP address %s not in canonical format, use %s instead",
                    ip_address.quote_c().c_str(),
                    temp.quote_c().c_str()
                );
                ip_address = temp;
            }
        }

        record::pointer rp =
            record::create(glocn, mac_address, name, ip_address);
        assert(rp);

        //
        // Check record sequencing.
        // It may seem arbitrary, but this finds common typographical errors.
        //
        if (last_rp && *rp <= *last_rp)
        {
            error
            (
                glocn,
                "address %s out of order",
                rp->get_mac_address().quote_c().c_str()
            );
            explain_sequence_errors();
        }
        last_rp = rp;

        //
        // return the record found.
        //
        return rp;
    }
}


space_ethers::record::~record()
{
}


space_ethers::record::record(
    const source_location &a_locn,
    const rcstring &a_mac_address,
    const rcstring &a_name,
    const rcstring &a_ip_address
) :
    locn(a_locn),
    mac_address(a_mac_address),
    name(a_name),
    ip_address(a_ip_address)
{
    ether_addr *eap = ether_aton(mac_address.c_str());
    if (eap)
        mac_address_binary = *eap;
    else
        memset(&mac_address_binary, 0, sizeof(mac_address_binary));
}


space_ethers::record::pointer
space_ethers::record::create(const source_location &a_locn,
    const rcstring &a_mac_address, const rcstring &a_name,
    const rcstring &a_ip_address)
{
    return
        pointer
        (
            new space_ethers::record
            (
                a_locn,
                a_mac_address,
                a_name,
                a_ip_address
            )
        );
}


rcstring
space_ethers::record::representation(void)
    const
{
    if (name.empty())
    {
        return (mac_address + " " + ip_address);
    }
    return (mac_address + " " + name);
}


int
space_ethers::record::compare(const space_ethers::record &rhs)
    const
{
    return
        memcmp
        (
            &mac_address_binary,
            &rhs.mac_address_binary,
            sizeof(mac_address_binary)
        );
}


bool
space_ethers::record::operator>(const space_ethers::record &rhs)
    const
{
    return (compare(rhs) > 0);
}


bool
space_ethers::record::operator>=(const space_ethers::record &rhs)
    const
{
    return (compare(rhs) >= 0);
}


bool
space_ethers::record::operator<(const space_ethers::record &rhs)
    const
{
    return (compare(rhs) < 0);
}


bool
space_ethers::record::operator<=(const space_ethers::record &rhs)
    const
{
    return (compare(rhs) <= 0);
}


// vim: set ts=8 sw=4 et :