/* $Id: HostDnsServiceResolvConf.cpp $ */
/** @file
 * Base class for Host DNS & Co services.
 */

/*
 * Copyright (C) 2014-2022 Oracle and/or its affiliates.
 *
 * This file is part of VirtualBox base platform packages, as
 * available from https://www.virtualbox.org.
 *
 * 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, in version 3 of the
 * License.
 *
 * 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 <https://www.gnu.org/licenses>.
 *
 * SPDX-License-Identifier: GPL-3.0-only
 */

/* -*- indent-tabs-mode: nil; -*- */
#include <VBox/com/string.h>
#include <VBox/com/ptr.h>


#ifdef RT_OS_OS2
# include <sys/socket.h>
typedef int socklen_t;
#endif

#include <stdio.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>


#include <iprt/assert.h>
#include <iprt/errcore.h>
#include <iprt/file.h>
#include <iprt/critsect.h>

#include <VBox/log.h>

#include <iprt/sanitized/string>

#include "HostDnsService.h"
#include "../../Devices/Network/slirp/resolv_conf_parser.h"


struct HostDnsServiceResolvConf::Data
{
    Data(const char *fileName)
        : resolvConfFilename(fileName)
    {
    };

    std::string resolvConfFilename;
};

HostDnsServiceResolvConf::~HostDnsServiceResolvConf()
{
    if (m)
    {
        delete m;
        m = NULL;
    }
}

HRESULT HostDnsServiceResolvConf::init(HostDnsMonitorProxy *pProxy, const char *aResolvConfFileName)
{
    HRESULT hr = HostDnsServiceBase::init(pProxy);
    AssertComRCReturn(hr, hr);

    m = new Data(aResolvConfFileName);
    AssertPtrReturn(m, E_OUTOFMEMORY);

    return readResolvConf();
}

void HostDnsServiceResolvConf::uninit(void)
{
    if (m)
    {
        delete m;
        m = NULL;
    }

    HostDnsServiceBase::uninit();
}

const std::string& HostDnsServiceResolvConf::getResolvConf(void) const
{
    return m->resolvConfFilename;
}

HRESULT HostDnsServiceResolvConf::readResolvConf(void)
{
    struct rcp_state st;

    st.rcps_flags = RCPSF_NO_STR2IPCONV;
    int rc = rcp_parse(&st, m->resolvConfFilename.c_str());
    if (rc == -1)
        return S_OK;

    HostDnsInformation info;
    for (unsigned i = 0; i != st.rcps_num_nameserver; ++i)
    {
        AssertBreak(st.rcps_str_nameserver[i]);
        info.servers.push_back(st.rcps_str_nameserver[i]);
    }

    if (st.rcps_domain)
        info.domain = st.rcps_domain;

    for (unsigned i = 0; i != st.rcps_num_searchlist; ++i)
    {
        AssertBreak(st.rcps_searchlist[i]);
        info.searchList.push_back(st.rcps_searchlist[i]);
    }
    setInfo(info);

    return S_OK;
}