qhostaddress.cpp

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// Copyright (C) 2017 The Qt Company Ltd.
// Copyright (C) 2016 Intel Corporation.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
 
#include "qhostaddress.h"
#include "qhostaddress_p.h"
#include "private/qipaddress_p.h"
#include "qdebug.h"
#if defined(Q_OS_WIN)
# include <winsock2.h>
# include <ws2tcpip.h>
#else
# include <netinet/in.h>
#endif
#include "qplatformdefs.h"
#include "qstringlist.h"
#include "qendian.h"
#ifndef QT_NO_DATASTREAM
#include <qdatastream.h>
#endif
#ifdef __SSE2__
#  include <private/qsimd_p.h>
#endif
 
#ifdef QT_LINUXBASE
#  include <arpa/inet.h>
#endif
 
QT_BEGIN_NAMESPACE
 
QHostAddressPrivate::QHostAddressPrivate()
    : a(0), protocol(QHostAddress::UnknownNetworkLayerProtocol)
{
    memset(&a6, 0, sizeof(a6));
}
 
void QHostAddressPrivate::setAddress(quint32 a_)
{
    a = a_;
    protocol = QHostAddress::IPv4Protocol;
 
    //create mapped address, except for a_ == 0 (any)
    a6_64.c[0] = 0;
    if (a) {
        a6_32.c[2] = qToBigEndian(0xffff);
        a6_32.c[3] = qToBigEndian(a);
    } else {
        a6_64.c[1] = 0;
    }
}
 
static bool convertToIpv4(quint32& a, const Q_IPV6ADDR &a6, const QHostAddress::ConversionMode mode)
{
    if (mode == QHostAddress::StrictConversion)
        return false;
 
    const uchar *ptr = a6.c;
    if (qFromUnaligned<quint64>(ptr) != 0)
        return false;
 
    const quint32 mid = qFromBigEndian<quint32>(ptr + 8);
    if ((mid == 0xffff) && (mode & QHostAddress::ConvertV4MappedToIPv4)) {
        a = qFromBigEndian<quint32>(ptr + 12);
        return true;
    }
    if (mid != 0)
        return false;
 
    const quint32 low = qFromBigEndian<quint32>(ptr + 12);
    if ((low == 0) && (mode & QHostAddress::ConvertUnspecifiedAddress)) {
        a = 0;
        return true;
    }
    if ((low == 1) && (mode & QHostAddress::ConvertLocalHost)) {
        a = INADDR_LOOPBACK;
        return true;
    }
    if ((low != 1) && (mode & QHostAddress::ConvertV4CompatToIPv4)) {
        a = low;
        return true;
    }
    return false;
}
 
void QHostAddressPrivate::setAddress(const quint8 *a_)
{
    protocol = QHostAddress::IPv6Protocol;
    memcpy(a6.c, a_, sizeof(a6));
    a = 0;
    convertToIpv4(a, a6, (QHostAddress::ConvertV4MappedToIPv4
                          | QHostAddress::ConvertUnspecifiedAddress));
}
 
void QHostAddressPrivate::setAddress(const Q_IPV6ADDR &a_)
{
    setAddress(a_.c);
}
 
static bool parseIp6(const QString &address, QIPAddressUtils::IPv6Address &addr, QString *scopeId)
{
    QStringView tmp(address);
    qsizetype scopeIdPos = tmp.lastIndexOf(u'%');
    if (scopeIdPos != -1) {
        *scopeId = tmp.mid(scopeIdPos + 1).toString();
        tmp.chop(tmp.size() - scopeIdPos);
    } else {
        scopeId->clear();
    }
    return QIPAddressUtils::parseIp6(addr, tmp.begin(), tmp.end()) == nullptr;
}
 
bool QHostAddressPrivate::parse(const QString &ipString)
{
    protocol = QHostAddress::UnknownNetworkLayerProtocol;
    QString a = ipString.simplified();
    if (a.isEmpty())
        return false;
 
    // All IPv6 addresses contain a ':', and may contain a '.'.
    if (a.contains(u':')) {
        quint8 maybeIp6[16];
        if (parseIp6(a, maybeIp6, &scopeId)) {
            setAddress(maybeIp6);
            return true;
        }
    }
 
    quint32 maybeIp4 = 0;
    if (QIPAddressUtils::parseIp4(maybeIp4, a.constBegin(), a.constEnd())) {
        setAddress(maybeIp4);
        return true;
    }
 
    return false;
}
 
void QHostAddressPrivate::clear()
{
    a = 0;
    protocol = QHostAddress::UnknownNetworkLayerProtocol;
    memset(&a6, 0, sizeof(a6));
}
 
AddressClassification QHostAddressPrivate::classify() const
{
    if (a) {
        // This is an IPv4 address or an IPv6 v4-mapped address includes all
        // IPv6 v4-compat addresses, except for ::ffff:0.0.0.0 (because `a' is
        // zero). See setAddress(quint8*) below, which calls convertToIpv4(),
        // for details.
        // Source: RFC 5735
        if ((a & 0xff000000U) == 0x7f000000U)   // 127.0.0.0/8
            return LoopbackAddress;
        if ((a & 0xf0000000U) == 0xe0000000U)   // 224.0.0.0/4
            return MulticastAddress;
        if ((a & 0xffff0000U) == 0xa9fe0000U)   // 169.254.0.0/16
            return LinkLocalAddress;
        if ((a & 0xff000000U) == 0)             // 0.0.0.0/8 except 0.0.0.0 (handled below)
            return LocalNetAddress;
        if ((a & 0xf0000000U) == 0xf0000000U) { // 240.0.0.0/4
            if (a == 0xffffffffU)               // 255.255.255.255
                return BroadcastAddress;
            return UnknownAddress;
        }
        if (((a & 0xff000000U) == 0x0a000000U)      // 10.0.0.0/8
            || ((a & 0xfff00000U) == 0xac100000U)   // 172.16.0.0/12
            || ((a & 0xffff0000U) == 0xc0a80000U))  // 192.168.0.0/16
            return PrivateNetworkAddress;
 
        // Not testing for TestNetworkAddress
        // since we don't need them yet.
        return GlobalAddress;
    }
 
    // As `a' is zero, this address is either ::ffff:0.0.0.0 or a non-v4-mapped IPv6 address.
    // Source: https://www.iana.org/assignments/ipv6-address-space/ipv6-address-space.xhtml
    if (a6_64.c[0]) {
        quint32 high16 = qFromBigEndian(a6_32.c[0]) >> 16;
        switch (high16 >> 8) {
        case 0xff:                          // ff00::/8
            return MulticastAddress;
        case 0xfe:
            switch (high16 & 0xffc0) {
            case 0xfec0:                    // fec0::/10
                return SiteLocalAddress;
 
            case 0xfe80:                    // fe80::/10
                return LinkLocalAddress;
 
            default:                        // fe00::/9
                return UnknownAddress;
            }
        case 0xfd:                          // fc00::/7
        case 0xfc:
            return UniqueLocalAddress;
        default:
            return GlobalAddress;
        }
    }
 
    quint64 low64 = qFromBigEndian(a6_64.c[1]);
    if (low64 == 1)                             // ::1
        return LoopbackAddress;
    if (low64 >> 32 == 0xffff) {                // ::ffff:0.0.0.0/96
        Q_ASSERT(quint32(low64) == 0);
        return LocalNetAddress;
    }
    if (low64)                                  // not ::
        return GlobalAddress;
 
    if (protocol == QHostAddress::UnknownNetworkLayerProtocol)
        return UnknownAddress;
 
    // only :: and 0.0.0.0 remain now
    return LocalNetAddress;
}
 
bool QNetmask::setAddress(const QHostAddress &address)
{
    static const quint8 zeroes[16] = { 0 };
    union {
        quint32 v4;
        quint8 v6[16];
    } ip;
 
    int netmask = 0;
    quint8 *ptr = ip.v6;
    quint8 *end;
    length = 255;
 
    if (address.protocol() == QHostAddress::IPv4Protocol) {
        ip.v4 = qToBigEndian(address.toIPv4Address());
        end = ptr + 4;
    } else if (address.protocol() == QHostAddress::IPv6Protocol) {
        memcpy(ip.v6, address.toIPv6Address().c, 16);
        end = ptr + 16;
    } else {
        return false;
    }
 
    while (ptr < end) {
        switch (*ptr) {
        case 255:
            netmask += 8;
            ++ptr;
            continue;
 
        default:
            return false;       // invalid IP-style netmask
 
        case 254:
            ++netmask;
            Q_FALLTHROUGH();
        case 252:
            ++netmask;
            Q_FALLTHROUGH();
        case 248:
            ++netmask;
            Q_FALLTHROUGH();
        case 240:
            ++netmask;
            Q_FALLTHROUGH();
        case 224:
            ++netmask;
            Q_FALLTHROUGH();
        case 192:
            ++netmask;
            Q_FALLTHROUGH();
        case 128:
            ++netmask;
            Q_FALLTHROUGH();
        case 0:
            break;
        }
        break;
    }
 
    // confirm that the rest is only zeroes
    if (ptr < end && memcmp(ptr + 1, zeroes, end - ptr - 1) != 0)
        return false;
 
    length = netmask;
    return true;
}
 
static void clearBits(quint8 *where, int start, int end)
{
    Q_ASSERT(end == 32 || end == 128);
    if (start == end)
        return;
 
    // for the byte where 'start' is, clear the lower bits only
    quint8 bytemask = 256 - (1 << (8 - (start & 7)));
    where[start / 8] &= bytemask;
 
    // for the tail part, clear everything
    memset(where + (start + 7) / 8, 0, end / 8 - (start + 7) / 8);
}
 
QHostAddress QNetmask::address(QHostAddress::NetworkLayerProtocol protocol) const
{
    if (length == 255 || protocol == QHostAddress::AnyIPProtocol ||
            protocol == QHostAddress::UnknownNetworkLayerProtocol) {
        return QHostAddress();
    } else if (protocol == QHostAddress::IPv4Protocol) {
        quint32 a;
        if (length == 0)
            a = 0;
        else if (length == 32)
            a = quint32(0xffffffff);
        else
            a = quint32(0xffffffff) >> (32 - length) << (32 - length);
        return QHostAddress(a);
    } else {
        Q_IPV6ADDR a6;
        memset(a6.c, 0xFF, sizeof(a6));
        clearBits(a6.c, length, 128);
        return QHostAddress(a6);
    }
}
 
QHostAddress::QHostAddress()
    : d(new QHostAddressPrivate)
{
}
 
QHostAddress::QHostAddress(quint32 ip4Addr)
    : d(new QHostAddressPrivate)
{
    setAddress(ip4Addr);
}
 
QHostAddress::QHostAddress(const quint8 *ip6Addr)
    : d(new QHostAddressPrivate)
{
    setAddress(ip6Addr);
}
 
QHostAddress::QHostAddress(const Q_IPV6ADDR &ip6Addr)
    : d(new QHostAddressPrivate)
{
    setAddress(ip6Addr);
}
 
QHostAddress::QHostAddress(const QString &address)
    : d(new QHostAddressPrivate)
{
    d->parse(address);
}
 
QHostAddress::QHostAddress(const struct sockaddr *sockaddr)
    : d(new QHostAddressPrivate)
{
    if (sockaddr->sa_family == AF_INET)
        setAddress(htonl(((const sockaddr_in *)sockaddr)->sin_addr.s_addr));
    else if (sockaddr->sa_family == AF_INET6)
        setAddress(((const sockaddr_in6 *)sockaddr)->sin6_addr.s6_addr);
}
 
QHostAddress::QHostAddress(const QHostAddress &address)
    : d(address.d)
{
}
 
QHostAddress::QHostAddress(SpecialAddress address)
    : d(new QHostAddressPrivate)
{
    setAddress(address);
}
 
QHostAddress::~QHostAddress()
{
}
 
QHostAddress &QHostAddress::operator=(const QHostAddress &address)
{
    d = address.d;
    return *this;
}
 
QHostAddress &QHostAddress::operator=(SpecialAddress address)
{
    setAddress(address);
    return *this;
}
 
void QHostAddress::clear()
{
    d.detach();
    d->clear();
}
 
void QHostAddress::setAddress(quint32 ip4Addr)
{
    d.detach();
    d->setAddress(ip4Addr);
}
 
void QHostAddress::setAddress(const quint8 *ip6Addr)
{
    d.detach();
    d->setAddress(ip6Addr);
}
 
void QHostAddress::setAddress(const Q_IPV6ADDR &ip6Addr)
{
    d.detach();
    d->setAddress(ip6Addr);
}
 
bool QHostAddress::setAddress(const QString &address)
{
    d.detach();
    return d->parse(address);
}
 
void QHostAddress::setAddress(const struct sockaddr *sockaddr)
{
    d.detach();
    clear();
    if (sockaddr->sa_family == AF_INET)
        setAddress(htonl(((const sockaddr_in *)sockaddr)->sin_addr.s_addr));
    else if (sockaddr->sa_family == AF_INET6)
        setAddress(((const sockaddr_in6 *)sockaddr)->sin6_addr.s6_addr);
}
 
void QHostAddress::setAddress(SpecialAddress address)
{
    clear();
 
    Q_IPV6ADDR ip6;
    memset(&ip6, 0, sizeof ip6);
    quint32 ip4 = INADDR_ANY;
 
    switch (address) {
    case Null:
        return;
 
    case Broadcast:
        ip4 = INADDR_BROADCAST;
        break;
    case LocalHost:
        ip4 = INADDR_LOOPBACK;
        break;
    case AnyIPv4:
        break;
 
    case LocalHostIPv6:
        ip6[15] = 1;
        Q_FALLTHROUGH();
    case AnyIPv6:
        d->setAddress(ip6);
        return;
 
    case Any:
        d->protocol = QHostAddress::AnyIPProtocol;
        return;
    }
 
    // common IPv4 part
    d->setAddress(ip4);
}
 
quint32 QHostAddress::toIPv4Address(bool *ok) const
{
    quint32 dummy;
    if (ok)
        *ok = d->protocol == QHostAddress::IPv4Protocol || d->protocol == QHostAddress::AnyIPProtocol
              || (d->protocol == QHostAddress::IPv6Protocol
                  && convertToIpv4(dummy, d->a6, ConversionMode(QHostAddress::ConvertV4MappedToIPv4
                                                                | QHostAddress::ConvertUnspecifiedAddress)));
    return d->a;
}
 
QHostAddress::NetworkLayerProtocol QHostAddress::protocol() const
{
    return QHostAddress::NetworkLayerProtocol(d->protocol);
}
 
Q_IPV6ADDR QHostAddress::toIPv6Address() const
{
    return d->a6;
}
 
QString QHostAddress::toString() const
{
    QString s;
    if (d->protocol == QHostAddress::IPv4Protocol
        || d->protocol == QHostAddress::AnyIPProtocol) {
        quint32 i = toIPv4Address();
        QIPAddressUtils::toString(s, i);
    } else if (d->protocol == QHostAddress::IPv6Protocol) {
        QIPAddressUtils::toString(s, d->a6.c);
        if (!d->scopeId.isEmpty())
            s += u'%' + d->scopeId;
    }
    return s;
}
 
QString QHostAddress::scopeId() const
{
    return (d->protocol == QHostAddress::IPv6Protocol) ? d->scopeId : QString();
}
 
void QHostAddress::setScopeId(const QString &id)
{
    d.detach();
    if (d->protocol == QHostAddress::IPv6Protocol)
        d->scopeId = id;
}
 
bool QHostAddress::operator==(const QHostAddress &other) const
{
    return d == other.d || isEqual(other, StrictConversion);
}
 
bool QHostAddress::isEqual(const QHostAddress &other, ConversionMode mode) const
{
    if (d == other.d)
        return true;
 
    if (d->protocol == QHostAddress::IPv4Protocol) {
        switch (other.d->protocol) {
        case QHostAddress::IPv4Protocol:
            return d->a == other.d->a;
        case QHostAddress::IPv6Protocol:
            quint32 a4;
            return convertToIpv4(a4, other.d->a6, mode) && (a4 == d->a);
        case QHostAddress::AnyIPProtocol:
            return (mode & QHostAddress::ConvertUnspecifiedAddress) && d->a == 0;
        case QHostAddress::UnknownNetworkLayerProtocol:
            return false;
        }
    }
 
    if (d->protocol == QHostAddress::IPv6Protocol) {
        switch (other.d->protocol) {
        case QHostAddress::IPv4Protocol:
            quint32 a4;
            return convertToIpv4(a4, d->a6, mode) && (a4 == other.d->a);
        case QHostAddress::IPv6Protocol:
            return memcmp(&d->a6, &other.d->a6, sizeof(Q_IPV6ADDR)) == 0;
        case QHostAddress::AnyIPProtocol:
            return (mode & QHostAddress::ConvertUnspecifiedAddress)
                    && (d->a6_64.c[0] == 0) && (d->a6_64.c[1] == 0);
        case QHostAddress::UnknownNetworkLayerProtocol:
            return false;
        }
    }
 
    if ((d->protocol == QHostAddress::AnyIPProtocol)
            && (mode & QHostAddress::ConvertUnspecifiedAddress)) {
        switch (other.d->protocol) {
        case QHostAddress::IPv4Protocol:
            return other.d->a == 0;
        case QHostAddress::IPv6Protocol:
            return (other.d->a6_64.c[0] == 0) && (other.d->a6_64.c[1] == 0);
        default:
            break;
        }
    }
 
    return d->protocol == other.d->protocol;
}
 
bool QHostAddress::operator ==(SpecialAddress other) const
{
    quint32 ip4 = INADDR_ANY;
    switch (other) {
    case Null:
        return d->protocol == QHostAddress::UnknownNetworkLayerProtocol;
 
    case Broadcast:
        ip4 = INADDR_BROADCAST;
        break;
 
    case LocalHost:
        ip4 = INADDR_LOOPBACK;
        break;
 
    case Any:
        return d->protocol == QHostAddress::AnyIPProtocol;
 
    case AnyIPv4:
        break;
 
    case LocalHostIPv6:
    case AnyIPv6:
        if (d->protocol == QHostAddress::IPv6Protocol) {
            quint64 second = quint8(other == LocalHostIPv6);  // 1 for localhost, 0 for any
            return d->a6_64.c[0] == 0 && d->a6_64.c[1] == qToBigEndian(second);
        }
        return false;
    }
 
    // common IPv4 part
    return d->protocol == QHostAddress::IPv4Protocol && d->a == ip4;
}
 
bool QHostAddress::isNull() const
{
    return d->protocol == QHostAddress::UnknownNetworkLayerProtocol;
}
 
bool QHostAddress::isInSubnet(const QHostAddress &subnet, int netmask) const
{
    if (subnet.protocol() != d->protocol || netmask < 0)
        return false;
 
    union {
        quint32 ip;
        quint8 data[4];
    } ip4, net4;
    const quint8 *ip;
    const quint8 *net;
    if (d->protocol == QHostAddress::IPv4Protocol) {
        if (netmask > 32)
            netmask = 32;
        ip4.ip = qToBigEndian(d->a);
        net4.ip = qToBigEndian(subnet.d->a);
        ip = ip4.data;
        net = net4.data;
    } else if (d->protocol == QHostAddress::IPv6Protocol) {
        if (netmask > 128)
            netmask = 128;
        ip = d->a6.c;
        net = subnet.d->a6.c;
    } else {
        return false;
    }
 
    if (netmask >= 8 && memcmp(ip, net, netmask / 8) != 0)
        return false;
    if ((netmask & 7) == 0)
        return true;
 
    // compare the last octet now
    quint8 bytemask = 256 - (1 << (8 - (netmask & 7)));
    quint8 ipbyte = ip[netmask / 8];
    quint8 netbyte = net[netmask / 8];
    return (ipbyte & bytemask) == (netbyte & bytemask);
}
 
bool QHostAddress::isInSubnet(const QPair<QHostAddress, int> &subnet) const
{
    return isInSubnet(subnet.first, subnet.second);
}
 
 
QPair<QHostAddress, int> QHostAddress::parseSubnet(const QString &subnet)
{
    // We support subnets in the form:
    //   ddd.ddd.ddd.ddd/nn
    //   ddd.ddd.ddd/nn
    //   ddd.ddd/nn
    //   ddd/nn
    //   ddd.ddd.ddd.
    //   ddd.ddd.ddd
    //   ddd.ddd.
    //   ddd.ddd
    //   ddd.
    //   ddd
    //   <ipv6-address>/nn
    //
    //  where nn can be an IPv4-style netmask for the IPv4 forms
 
    const QPair<QHostAddress, int> invalid = qMakePair(QHostAddress(), -1);
    if (subnet.isEmpty())
        return invalid;
 
    qsizetype slash = subnet.indexOf(u'/');
    QStringView netStr(subnet);
    if (slash != -1)
        netStr.truncate(slash);
 
    int netmask = -1;
    bool isIpv6 = netStr.contains(u':');
 
    if (slash != -1) {
        // is the netmask given in IP-form or in bit-count form?
        if (!isIpv6 && subnet.indexOf(u'.', slash + 1) != -1) {
            // IP-style, convert it to bit-count form
            QHostAddress mask;
            QNetmask parser;
            if (!mask.setAddress(subnet.mid(slash + 1)))
                return invalid;
            if (!parser.setAddress(mask))
                return invalid;
            netmask = parser.prefixLength();
        } else {
            bool ok;
            netmask = QStringView{subnet}.mid(slash + 1).toUInt(&ok);
            if (!ok)
                return invalid;     // failed to parse the subnet
        }
    }
 
    if (isIpv6) {
        // looks like it's an IPv6 address
        if (netmask > 128)
            return invalid;     // invalid netmask
        if (netmask < 0)
            netmask = 128;
 
        QHostAddress net;
        if (!net.setAddress(netStr.toString()))
            return invalid;     // failed to parse the IP
 
        clearBits(net.d->a6.c, netmask, 128);
        return qMakePair(net, netmask);
    }
 
    if (netmask > 32)
        return invalid;         // invalid netmask
 
    // parse the address manually
    auto parts = netStr.split(u'.');
    if (parts.isEmpty() || parts.size() > 4)
        return invalid;         // invalid IPv4 address
 
    if (parts.constLast().isEmpty())
        parts.removeLast();
 
    quint32 addr = 0;
    for (int i = 0; i < parts.size(); ++i) {
        bool ok;
        uint byteValue = parts.at(i).toUInt(&ok);
        if (!ok || byteValue > 255)
            return invalid;     // invalid IPv4 address
 
        addr <<= 8;
        addr += byteValue;
    }
    addr <<= 8 * (4 - parts.size());
    if (netmask == -1) {
        netmask = 8 * parts.size();
    } else if (netmask == 0) {
        // special case here
        // x86's instructions "shr" and "shl" do not operate when
        // their argument is 32, so the code below doesn't work as expected
        addr = 0;
    } else if (netmask != 32) {
        // clear remaining bits
        quint32 mask = quint32(0xffffffff) >> (32 - netmask) << (32 - netmask);
        addr &= mask;
    }
 
    return qMakePair(QHostAddress(addr), netmask);
}
 
bool QHostAddress::isLoopback() const
{
    return d->classify() == LoopbackAddress;
}
 
bool QHostAddress::isGlobal() const
{
    return d->classify() & GlobalAddress;   // GlobalAddress is a bit
}
 
bool QHostAddress::isLinkLocal() const
{
    return d->classify() == LinkLocalAddress;
}
 
bool QHostAddress::isSiteLocal() const
{
    return d->classify() == SiteLocalAddress;
}
 
bool QHostAddress::isUniqueLocalUnicast() const
{
    return d->classify() == UniqueLocalAddress;
}
 
bool QHostAddress::isMulticast() const
{
    return d->classify() == MulticastAddress;
}
 
bool QHostAddress::isBroadcast() const
{
    return d->classify() == BroadcastAddress;
}
 
bool QHostAddress::isPrivateUse() const
{
    const AddressClassification classification = d->classify();
    return (classification == PrivateNetworkAddress) || (classification == UniqueLocalAddress);
}
 
#ifndef QT_NO_DEBUG_STREAM
QDebug operator<<(QDebug d, const QHostAddress &address)
{
    QDebugStateSaver saver(d);
    d.resetFormat().nospace();
    if (address == QHostAddress::Any)
        d << "QHostAddress(QHostAddress::Any)";
    else
        d << "QHostAddress(" << address.toString() << ')';
    return d;
}
#endif
 
size_t qHash(const QHostAddress &key, size_t seed) noexcept
{
    return qHashBits(key.d->a6.c, 16, seed);
}
 
#ifndef QT_NO_DATASTREAM
 
QDataStream &operator<<(QDataStream &out, const QHostAddress &address)
{
    qint8 prot;
    prot = qint8(address.protocol());
    out << prot;
    switch (address.protocol()) {
    case QHostAddress::UnknownNetworkLayerProtocol:
    case QHostAddress::AnyIPProtocol:
        break;
    case QHostAddress::IPv4Protocol:
        out << address.toIPv4Address();
        break;
    case QHostAddress::IPv6Protocol:
    {
        Q_IPV6ADDR ipv6 = address.toIPv6Address();
        for (int i = 0; i < 16; ++i)
            out << ipv6[i];
        out << address.scopeId();
    }
        break;
    }
    return out;
}
 
QDataStream &operator>>(QDataStream &in, QHostAddress &address)
{
    qint8 prot;
    in >> prot;
    switch (QHostAddress::NetworkLayerProtocol(prot)) {
    case QHostAddress::UnknownNetworkLayerProtocol:
        address.clear();
        break;
    case QHostAddress::IPv4Protocol:
    {
        quint32 ipv4;
        in >> ipv4;
        address.setAddress(ipv4);
    }
        break;
    case QHostAddress::IPv6Protocol:
    {
        Q_IPV6ADDR ipv6;
        for (int i = 0; i < 16; ++i)
            in >> ipv6[i];
        address.setAddress(ipv6);
 
        QString scope;
        in >> scope;
        address.setScopeId(scope);
    }
        break;
    case QHostAddress::AnyIPProtocol:
        address = QHostAddress::Any;
        break;
    default:
        address.clear();
        in.setStatus(QDataStream::ReadCorruptData);
    }
    return in;
}
 
#endif //QT_NO_DATASTREAM
 
QT_END_NAMESPACE
 
#include "moc_qhostaddress.cpp"