/****************************************************************************

**

** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).

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** Contact: Nokia Corporation (qt-info@nokia.com)

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** This file is part of the QtNetwork module of the Qt Toolkit.

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** No Commercial Usage

** This file contains pre-release code and may not be distributed.

** You may use this file in accordance with the terms and conditions

** contained in the Technology Preview License Agreement accompanying

** this package.

**

** GNU Lesser General Public License Usage

** Alternatively, this file may be used under the terms of the GNU Lesser

** General Public License version 2.1 as published by the Free Software

** Foundation and appearing in the file LICENSE.LGPL included in the

** packaging of this file.  Please review the following information to

** ensure the GNU Lesser General Public License version 2.1 requirements

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** rights.  These rights are described in the Nokia Qt LGPL Exception

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****************************************************************************/

#include "qnetworkinterface.h"

#include "qnetworkinterface_p.h"

#ifndef QT_NO_NETWORKINTERFACE

#include "qnetworkinterface_win_p.h"

#include <qhostinfo.h>

#include <qhash.h>

#include <qurl.h>

QT_BEGIN_NAMESPACE

typedef DWORD (WINAPI *PtrGetAdaptersInfo)(PIP_ADAPTER_INFO, PULONG);

static PtrGetAdaptersInfo ptrGetAdaptersInfo = 0;

typedef ULONG (WINAPI *PtrGetAdaptersAddresses)(ULONG, ULONG, PVOID, PIP_ADAPTER_ADDRESSES, PULONG);

static PtrGetAdaptersAddresses ptrGetAdaptersAddresses = 0;

typedef DWORD (WINAPI *PtrGetNetworkParams)(PFIXED_INFO, PULONG);

static PtrGetNetworkParams ptrGetNetworkParams = 0;

static void resolveLibs()

{

    // try to find the functions we need from Iphlpapi.dll

    static bool done = false;

    if (!done) {

        done = true;

        HINSTANCE iphlpapiHnd = LoadLibrary(L"iphlpapi");

        if (iphlpapiHnd == NULL)

            return;

#if defined(Q_OS_WINCE)

        ptrGetAdaptersInfo = (PtrGetAdaptersInfo)GetProcAddress(iphlpapiHnd, L"GetAdaptersInfo");

        ptrGetAdaptersAddresses = (PtrGetAdaptersAddresses)GetProcAddress(iphlpapiHnd, L"GetAdaptersAddresses");

        ptrGetNetworkParams = (PtrGetNetworkParams)GetProcAddress(iphlpapiHnd, L"GetNetworkParams");

#else

        ptrGetAdaptersInfo = (PtrGetAdaptersInfo)GetProcAddress(iphlpapiHnd, "GetAdaptersInfo");

        ptrGetAdaptersAddresses = (PtrGetAdaptersAddresses)GetProcAddress(iphlpapiHnd, "GetAdaptersAddresses");

        ptrGetNetworkParams = (PtrGetNetworkParams)GetProcAddress(iphlpapiHnd, "GetNetworkParams");

#endif

    }

}

static QHostAddress addressFromSockaddr(sockaddr *sa)

{

    QHostAddress address;

    if (!sa)

        return address;

    if (sa->sa_family == AF_INET)

        address.setAddress(htonl(((sockaddr_in *)sa)->sin_addr.s_addr));

    else if (sa->sa_family == AF_INET6)

        address.setAddress(((qt_sockaddr_in6 *)sa)->sin6_addr.qt_s6_addr);

    else

        qWarning("Got unknown socket family %d", sa->sa_family);

    return address;

}

static QHash<QHostAddress, QHostAddress> ipv4Netmasks()

{

    //Retrieve all the IPV4 addresses & netmasks

    IP_ADAPTER_INFO staticBuf[2]; // 2 is arbitrary

    PIP_ADAPTER_INFO pAdapter = staticBuf;

    ULONG bufSize = sizeof staticBuf;

    QHash<QHostAddress, QHostAddress> ipv4netmasks; 

    DWORD retval = ptrGetAdaptersInfo(pAdapter, &bufSize);

    if (retval == ERROR_BUFFER_OVERFLOW) {

        // need more memory

        pAdapter = (IP_ADAPTER_INFO *)qMalloc(bufSize);

        if (!pAdapter)

            return ipv4netmasks;

        // try again

        if (ptrGetAdaptersInfo(pAdapter, &bufSize) != ERROR_SUCCESS) {

            qFree(pAdapter);

            return ipv4netmasks;

        }

    } else if (retval != ERROR_SUCCESS) {

        // error

        return ipv4netmasks;

    }

    // iterate over the list and add the entries to our listing

    for (PIP_ADAPTER_INFO ptr = pAdapter; ptr; ptr = ptr->Next) {

        for (PIP_ADDR_STRING addr = &ptr->IpAddressList; addr; addr = addr->Next) {

            QHostAddress address(QLatin1String(addr->IpAddress.String));

            QHostAddress mask(QLatin1String(addr->IpMask.String));

            ipv4netmasks[address] = mask;

        }

    }

    if (pAdapter != staticBuf)

        qFree(pAdapter);

    return ipv4netmasks;

}

static QList<QNetworkInterfacePrivate *> interfaceListingWinXP()

{

    QList<QNetworkInterfacePrivate *> interfaces;

    IP_ADAPTER_ADDRESSES staticBuf[2]; // 2 is arbitrary

    PIP_ADAPTER_ADDRESSES pAdapter = staticBuf;

    ULONG bufSize = sizeof staticBuf;

    const QHash<QHostAddress, QHostAddress> &ipv4netmasks = ipv4Netmasks();

    ULONG flags = GAA_FLAG_INCLUDE_ALL_INTERFACES |

                  GAA_FLAG_INCLUDE_PREFIX |

                  GAA_FLAG_SKIP_DNS_SERVER |

                  GAA_FLAG_SKIP_MULTICAST;

    ULONG retval = ptrGetAdaptersAddresses(AF_UNSPEC, flags, NULL, pAdapter, &bufSize);

    if (retval == ERROR_BUFFER_OVERFLOW) {

        // need more memory

        pAdapter = (IP_ADAPTER_ADDRESSES *)qMalloc(bufSize);

        if (!pAdapter)

            return interfaces;

        // try again

        if (ptrGetAdaptersAddresses(AF_UNSPEC, flags, NULL, pAdapter, &bufSize) != ERROR_SUCCESS) {

            qFree(pAdapter);

            return interfaces;

        }

    } else if (retval != ERROR_SUCCESS) {

        // error

        return interfaces;

    }

    // iterate over the list and add the entries to our listing

    for (PIP_ADAPTER_ADDRESSES ptr = pAdapter; ptr; ptr = ptr->Next) {

        QNetworkInterfacePrivate *iface = new QNetworkInterfacePrivate;

        interfaces << iface;

        iface->index = 0;

        if (ptr->Length >= offsetof(IP_ADAPTER_ADDRESSES, Ipv6IfIndex) && ptr->Ipv6IfIndex != 0)

            iface->index = ptr->Ipv6IfIndex;

        else if (ptr->IfIndex != 0)

            iface->index = ptr->IfIndex;

        iface->flags = QNetworkInterface::CanBroadcast;

        if (ptr->OperStatus == IfOperStatusUp)

            iface->flags |= QNetworkInterface::IsUp | QNetworkInterface::IsRunning;

        if ((ptr->Flags & IP_ADAPTER_NO_MULTICAST) == 0)

            iface->flags |= QNetworkInterface::CanMulticast;

        iface->name = QString::fromLocal8Bit(ptr->AdapterName);

        iface->friendlyName = QString::fromWCharArray(ptr->FriendlyName);

        if (ptr->PhysicalAddressLength)

            iface->hardwareAddress = iface->makeHwAddress(ptr->PhysicalAddressLength,

                                                          ptr->PhysicalAddress);

        else

            // loopback if it has no address

            iface->flags |= QNetworkInterface::IsLoopBack;

        // The GetAdaptersAddresses call has an interesting semantic:

        // It can return a number N of addresses and a number M of prefixes.

        // But if you have IPv6 addresses, generally N > M.

        // I cannot find a way to relate the Address to the Prefix, aside from stopping

        // the iteration at the last Prefix entry and assume that it applies to all addresses

        // from that point on.

        PIP_ADAPTER_PREFIX pprefix = 0;

        if (ptr->Length >= offsetof(IP_ADAPTER_ADDRESSES, FirstPrefix))

            pprefix = ptr->FirstPrefix;

        for (PIP_ADAPTER_UNICAST_ADDRESS addr = ptr->FirstUnicastAddress; addr; addr = addr->Next) {

            QNetworkAddressEntry entry;

            entry.setIp(addressFromSockaddr(addr->Address.lpSockaddr));

            if (pprefix) {

                if (entry.ip().protocol() == QAbstractSocket::IPv4Protocol) {

                    entry.setNetmask(ipv4netmasks[entry.ip()]);

                    // broadcast address is set on postProcess()

                } else { //IPV6

                    entry.setPrefixLength(pprefix->PrefixLength);

                }

                pprefix = pprefix->Next ? pprefix->Next : pprefix;

            }

            iface->addressEntries << entry;

        }

    }

    if (pAdapter != staticBuf)

        qFree(pAdapter);

    return interfaces;

}

static QList<QNetworkInterfacePrivate *> interfaceListingWin2k()

{

    QList<QNetworkInterfacePrivate *> interfaces;

    IP_ADAPTER_INFO staticBuf[2]; // 2 is arbitrary

    PIP_ADAPTER_INFO pAdapter = staticBuf;

    ULONG bufSize = sizeof staticBuf;

    DWORD retval = ptrGetAdaptersInfo(pAdapter, &bufSize);

    if (retval == ERROR_BUFFER_OVERFLOW) {

        // need more memory

        pAdapter = (IP_ADAPTER_INFO *)qMalloc(bufSize);

        if (!pAdapter)

            return interfaces;

        // try again

        if (ptrGetAdaptersInfo(pAdapter, &bufSize) != ERROR_SUCCESS) {

            qFree(pAdapter);

            return interfaces;

        }

    } else if (retval != ERROR_SUCCESS) {

        // error

        return interfaces;

    }

    // iterate over the list and add the entries to our listing

    for (PIP_ADAPTER_INFO ptr = pAdapter; ptr; ptr = ptr->Next) {

        QNetworkInterfacePrivate *iface = new QNetworkInterfacePrivate;

        interfaces << iface;

        iface->index = ptr->Index;

        iface->flags = QNetworkInterface::IsUp | QNetworkInterface::IsRunning;

        if (ptr->Type == MIB_IF_TYPE_PPP)

            iface->flags |= QNetworkInterface::IsPointToPoint;

        else

            iface->flags |= QNetworkInterface::CanBroadcast;

        iface->name = QString::fromLocal8Bit(ptr->AdapterName);

        iface->hardwareAddress = QNetworkInterfacePrivate::makeHwAddress(ptr->AddressLength,

                                                                         ptr->Address);

        for (PIP_ADDR_STRING addr = &ptr->IpAddressList; addr; addr = addr->Next) {

            QNetworkAddressEntry entry;

            entry.setIp(QHostAddress(QLatin1String(addr->IpAddress.String)));

            entry.setNetmask(QHostAddress(QLatin1String(addr->IpMask.String)));

            // broadcast address is set on postProcess()

            iface->addressEntries << entry;

        }

    }

    if (pAdapter != staticBuf)

        qFree(pAdapter);

    return interfaces;

}

static QList<QNetworkInterfacePrivate *> interfaceListing()

{

    resolveLibs();

    if (ptrGetAdaptersAddresses != NULL)

        return interfaceListingWinXP();

    else if (ptrGetAdaptersInfo != NULL)

        return interfaceListingWin2k();

    // failed

    return QList<QNetworkInterfacePrivate *>();

}

QList<QNetworkInterfacePrivate *> QNetworkInterfaceManager::scan()

{

    return interfaceListing();

}

QString QHostInfo::localDomainName()

{

    resolveLibs();

    if (ptrGetNetworkParams == NULL)

        return QString();       // couldn't resolve

    FIXED_INFO info, *pinfo;

    ULONG bufSize = sizeof info;

    pinfo = &info;

    if (ptrGetNetworkParams(pinfo, &bufSize) == ERROR_BUFFER_OVERFLOW) {

        pinfo = (FIXED_INFO *)qMalloc(bufSize);

        if (!pinfo)

            return QString();

        // try again

        if (ptrGetNetworkParams(pinfo, &bufSize) != ERROR_SUCCESS) {

            qFree(pinfo);

            return QString();   // error

        }

    }

    QString domainName = QUrl::fromAce(pinfo->DomainName);

    if (pinfo != &info)

        qFree(pinfo);

    return domainName;

}

QT_END_NAMESPACE

#endif // QT_NO_NETWORKINTERFACE