qhostaddress.cpp

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#include "qhostaddress.h"
#include "qhostaddress_p.h"
#include "qdebug.h"
#include "qplatformdefs.h"
#include "qstringlist.h"
#include "qendian.h"
#ifndef QT_NO_DATASTREAM
#include <qdatastream.h>
#endif
#if defined(Q_OS_WINCE)
#include <winsock.h>
#endif

#ifdef QT_LINUXBASE
#  include <arpa/inet.h>
#endif

QT_BEGIN_NAMESPACE

#define QT_ENSURE_PARSED(a) \
    do { \
        if (!(a)->d->isParsed) \
            (a)->d->parse(); \
    } while (0)

#ifdef Q_OS_WIN
#    if !defined (QT_NO_IPV6)
// sockaddr_in6 size changed between old and new SDK
// Only the new version is the correct one, so always
// use this structure.
#if defined(Q_OS_WINCE)
#  if !defined(u_char)
#    define u_char unsigned char
#  endif
#  if !defined(u_short)
#    define u_short unsigned short
#  endif
#  if !defined(u_long)
#    define u_long unsigned long
#  endif
#endif
struct qt_in6_addr {
    u_char qt_s6_addr[16];
};
typedef struct {
    short   sin6_family;            /* AF_INET6 */
    u_short sin6_port;              /* Transport level port number */
    u_long  sin6_flowinfo;          /* IPv6 flow information */
    struct  qt_in6_addr sin6_addr;  /* IPv6 address */
    u_long  sin6_scope_id;          /* set of interfaces for a scope */
} qt_sockaddr_in6;
#    else
typedef void * qt_sockaddr_in6 ;
#    endif
#    ifndef AF_INET6
#        define AF_INET6        23  /* Internetwork Version 6 */
#    endif
#else
#define qt_sockaddr_in6 sockaddr_in6
#define qt_s6_addr s6_addr
#endif


class QHostAddressPrivate
{
public:
    QHostAddressPrivate();

    void setAddress(quint32 a_ = 0);
    void setAddress(const quint8 *a_);
    void setAddress(const Q_IPV6ADDR &a_);

    bool parse();
    void clear();

    quint32 a;    // IPv4 address
    Q_IPV6ADDR a6; // IPv6 address
    QAbstractSocket::NetworkLayerProtocol protocol;

    QString ipString;
    bool isParsed;
    QString scopeId;

    friend class QHostAddress;
};

QHostAddressPrivate::QHostAddressPrivate()
    : a(0), protocol(QAbstractSocket::UnknownNetworkLayerProtocol), isParsed(true)
{
    memset(&a6, 0, sizeof(a6));
}

void QHostAddressPrivate::setAddress(quint32 a_)
{
    a = a_;
    protocol = QAbstractSocket::IPv4Protocol;
    isParsed = true;
}

void QHostAddressPrivate::setAddress(const quint8 *a_)
{
    for (int i = 0; i < 16; i++)
        a6[i] = a_[i];
    protocol = QAbstractSocket::IPv6Protocol;
    isParsed = true;
}

void QHostAddressPrivate::setAddress(const Q_IPV6ADDR &a_)
{
    a6 = a_;
    a = 0;
    protocol = QAbstractSocket::IPv6Protocol;
    isParsed = true;
}

static bool parseIp4(const QString& address, quint32 *addr)
{
    QStringList ipv4 = address.split(QLatin1String("."));
    if (ipv4.count() != 4)
        return false;

    quint32 ipv4Address = 0;
    for (int i = 0; i < 4; ++i) {
        bool ok = false;
        uint byteValue = ipv4.at(i).toUInt(&ok);
        if (!ok || byteValue > 255)
            return false;

        ipv4Address <<= 8;
        ipv4Address += byteValue;
    }

    *addr = ipv4Address;
    return true;
}

static bool parseIp6(const QString &address, quint8 *addr, QString *scopeId)
{
    QString tmp = address;
    int scopeIdPos = tmp.lastIndexOf(QLatin1Char('%'));
    if (scopeIdPos != -1) {
        *scopeId = tmp.mid(scopeIdPos + 1);
        tmp.chop(tmp.size() - scopeIdPos);
    } else {
        scopeId->clear();
    }

    QStringList ipv6 = tmp.split(QLatin1String(":"));
    int count = ipv6.count();
    if (count < 3 || count > 8)
        return false;

    int colonColon = tmp.count(QLatin1String("::"));
    if(count == 8 && colonColon > 1)
        return false;

    // address can be compressed with a "::", but that
    // may only appear once (see RFC 1884)
    // the statement below means:
    // if(shortened notation is not used AND
    // ((pure IPv6 notation AND less than 8 parts) OR
    // ((mixed IPv4/6 notation AND less than 7 parts)))
    if(colonColon != 1 && count < (tmp.contains(QLatin1Char('.')) ? 7 : 8))
        return false;

    int mc = 16;
    int fillCount = 9 - count;  // number of 0 words to fill in the middle
    for (int i = count - 1; i >= 0; --i) {
        if (mc <= 0)
            return false;

        if (ipv6.at(i).isEmpty()) {
            if (i == count - 1) {
                // special case: ":" is last character
                if (!ipv6.at(i - 1).isEmpty())
                    return false;
                addr[--mc] = 0;
                addr[--mc] = 0;
            } else if (i == 0) {
                // special case: ":" is first character
                if (!ipv6.at(i + 1).isEmpty())
                    return false;
                addr[--mc] = 0;
                addr[--mc] = 0;
            } else {
                for (int j = 0; j < fillCount; ++j) {
                    if (mc <= 0)
                        return false;
                    addr[--mc] = 0;
                    addr[--mc] = 0;
                }
            }
        } else {
            bool ok = false;
            uint byteValue = ipv6.at(i).toUInt(&ok, 16);
            if (ok && byteValue <= 0xffff) {
                addr[--mc] = byteValue & 0xff;
                addr[--mc] = (byteValue >> 8) & 0xff;
            } else {
                if (i != count - 1)
                    return false;

                // parse the ipv4 part of a mixed type
                quint32 maybeIp4;
                if (!parseIp4(ipv6.at(i), &maybeIp4))
                    return false;

                addr[--mc] = maybeIp4 & 0xff;
                addr[--mc] = (maybeIp4 >> 8) & 0xff;
                addr[--mc] = (maybeIp4 >> 16) & 0xff;
                addr[--mc] = (maybeIp4 >> 24) & 0xff;
                --fillCount;
            }
        }
    }

    return true;
}

bool QHostAddressPrivate::parse()
{
    isParsed = true;
    protocol = QAbstractSocket::UnknownNetworkLayerProtocol;
    QString a = ipString.simplified();

    // All IPv6 addresses contain a ':', and may contain a '.'.
    if (a.contains(QLatin1Char(':'))) {
        quint8 maybeIp6[16];
        if (parseIp6(a, maybeIp6, &scopeId)) {
            setAddress(maybeIp6);
            protocol = QAbstractSocket::IPv6Protocol;
            return true;
        }
    }

    // All IPv4 addresses contain a '.'.
    if (a.contains(QLatin1Char('.'))) {
        quint32 maybeIp4 = 0;
        if (parseIp4(a, &maybeIp4)) {
            setAddress(maybeIp4);
            protocol = QAbstractSocket::IPv4Protocol;
            return true;
        }
    }

    return false;
}

void QHostAddressPrivate::clear()
{
    a = 0;
    protocol = QAbstractSocket::UnknownNetworkLayerProtocol;
    isParsed = true;
    memset(&a6, 0, sizeof(a6));
}


bool QNetmaskAddress::setAddress(const QString &address)
{
    length = -1;
    QHostAddress other;
    return other.setAddress(address) && setAddress(other);
}

bool QNetmaskAddress::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 = -1;

    QHostAddress::operator=(address);

    if (d->protocol == QAbstractSocket::IPv4Protocol) {
        ip.v4 = qToBigEndian(d->a);
        end = ptr + 4;
    } else if (d->protocol == QAbstractSocket::IPv6Protocol) {
        memcpy(ip.v6, d->a6.c, 16);
        end = ptr + 16;
    } else {
        d->clear();
        return false;
    }

    while (ptr < end) {
        switch (*ptr) {
        case 255:
            netmask += 8;
            ++ptr;
            continue;

        default:
            d->clear();
            return false;       // invalid IP-style netmask

            // the rest always falls through
        case 254:
            ++netmask;
        case 252:
            ++netmask;
        case 248:
            ++netmask;
        case 240:
            ++netmask;
        case 224:
            ++netmask;
        case 192:
            ++netmask;
        case 128:
            ++netmask;
        case 0:
            break;
        }
        break;
    }

    // confirm that the rest is only zeroes
    if (ptr < end && memcmp(ptr + 1, zeroes, end - ptr - 1) != 0) {
        d->clear();
        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);
}

int QNetmaskAddress::prefixLength() const
{
    return length;
}

void QNetmaskAddress::setPrefixLength(QAbstractSocket::NetworkLayerProtocol proto, int newLength)
{
    length = newLength;
    if (length < 0 || length > (proto == QAbstractSocket::IPv4Protocol ? 32 :
                                proto == QAbstractSocket::IPv6Protocol ? 128 : -1)) {
        // invalid information, reject
        d->protocol = QAbstractSocket::UnknownNetworkLayerProtocol;
        length = -1;
        return;
    }

    d->protocol = proto;
    if (d->protocol == QAbstractSocket::IPv4Protocol) {
        if (length == 0) {
            d->a = 0;
        } else if (length == 32) {
            d->a = quint32(0xffffffff);
        } else {
            d->a = quint32(0xffffffff) >> (32 - length) << (32 - length);
        }
    } else {
        memset(d->a6.c, 0xFF, sizeof(d->a6));
        clearBits(d->a6.c, length, 128);
    }
}

QHostAddress::QHostAddress()
    : d(new QHostAddressPrivate)
{
}

QHostAddress::QHostAddress(quint32 ip4Addr)
    : d(new QHostAddressPrivate)
{
    setAddress(ip4Addr);
}

QHostAddress::QHostAddress(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->ipString = address;
    d->isParsed = false;
}

QHostAddress::QHostAddress(const struct sockaddr *sockaddr)
    : d(new QHostAddressPrivate)
{
    if (sockaddr->sa_family == AF_INET)
        setAddress(htonl(((sockaddr_in *)sockaddr)->sin_addr.s_addr));
#ifndef QT_NO_IPV6
    else if (sockaddr->sa_family == AF_INET6)
        setAddress(((qt_sockaddr_in6 *)sockaddr)->sin6_addr.qt_s6_addr);
#endif
}

QHostAddress::QHostAddress(const QHostAddress &address)
    : d(new QHostAddressPrivate(*address.d.data()))
{
}

QHostAddress::QHostAddress(SpecialAddress address)
    : d(new QHostAddressPrivate)
{
    switch (address) {
    case Null:
        break;
    case Broadcast:
        setAddress(QLatin1String("255.255.255.255"));
        break;
    case LocalHost:
        setAddress(QLatin1String("127.0.0.1"));
        break;
    case LocalHostIPv6:
        setAddress(QLatin1String("::1"));
        break;
    case Any:
        setAddress(QLatin1String("0.0.0.0"));
        break;
    case AnyIPv6:
        setAddress(QLatin1String("::"));
        break;
    }
}

QHostAddress::~QHostAddress()
{
}

QHostAddress &QHostAddress::operator=(const QHostAddress &address)
{
    *d.data() = *address.d.data();
    return *this;
}

QHostAddress &QHostAddress::operator=(const QString &address)
{
    setAddress(address);
    return *this;
}

void QHostAddress::clear()
{
    d->clear();
}

void QHostAddress::setAddress(quint32 ip4Addr)
{
    d->setAddress(ip4Addr);
}

void QHostAddress::setAddress(quint8 *ip6Addr)
{
    d->setAddress(ip6Addr);
}

void QHostAddress::setAddress(const Q_IPV6ADDR &ip6Addr)
{
    d->setAddress(ip6Addr);
}

bool QHostAddress::setAddress(const QString &address)
{
    d->ipString = address;
    return d->parse();
}

void QHostAddress::setAddress(const struct sockaddr *sockaddr)
{
    clear();
    if (sockaddr->sa_family == AF_INET)
        setAddress(htonl(((sockaddr_in *)sockaddr)->sin_addr.s_addr));
#ifndef QT_NO_IPV6
    else if (sockaddr->sa_family == AF_INET6)
        setAddress(((qt_sockaddr_in6 *)sockaddr)->sin6_addr.qt_s6_addr);
#endif
}

quint32 QHostAddress::toIPv4Address() const
{
    QT_ENSURE_PARSED(this);
    return d->a;
}

QAbstractSocket::NetworkLayerProtocol QHostAddress::protocol() const
{
    QT_ENSURE_PARSED(this);
    return d->protocol;
}

Q_IPV6ADDR QHostAddress::toIPv6Address() const
{
    QT_ENSURE_PARSED(this);
    return d->a6;
}

QString QHostAddress::toString() const
{
    QT_ENSURE_PARSED(this);
    if (d->protocol == QAbstractSocket::IPv4Protocol) {
        quint32 i = toIPv4Address();
        QString s;
        s.sprintf("%d.%d.%d.%d", (i>>24) & 0xff, (i>>16) & 0xff,
                (i >> 8) & 0xff, i & 0xff);
        return s;
    }

    if (d->protocol == QAbstractSocket::IPv6Protocol) {
        quint16 ugle[8];
        for (int i = 0; i < 8; i++) {
            ugle[i] = (quint16(d->a6[2*i]) << 8) | quint16(d->a6[2*i+1]);
        }
        QString s;
        QString temp;
        bool zeroDetected = false;
        bool zeroShortened = false;
        for (int i = 0; i < 8; i++) {
            if ((ugle[i] != 0) || zeroShortened) {
                temp.sprintf("%X", ugle[i]);
                s.append(temp);
                if (zeroDetected)
                    zeroShortened = true;
            } else {
                if (!zeroDetected) {
                    if (i<7 && (ugle[i+1] == 0)) {
                        s.append(QLatin1Char(':'));
                        zeroDetected = true;
                    } else {
                        temp.sprintf("%X", ugle[i]);
                        s.append(temp);
                        if (i<7)
                            s.append(QLatin1Char(':'));
                    }
                }
            }
            if (i<7 && ((ugle[i] != 0) || zeroShortened || (i==0 && zeroDetected)))
                s.append(QLatin1Char(':'));
        }

        if (!d->scopeId.isEmpty())
            s.append(QLatin1Char('%') + d->scopeId);
        return s;
    }

    return QString();
}

QString QHostAddress::scopeId() const
{
    QT_ENSURE_PARSED(this);
    return (d->protocol == QAbstractSocket::IPv6Protocol) ? d->scopeId : QString();
}

void QHostAddress::setScopeId(const QString &id)
{
    QT_ENSURE_PARSED(this);
    if (d->protocol == QAbstractSocket::IPv6Protocol)
        d->scopeId = id;
}

bool QHostAddress::operator==(const QHostAddress &other) const
{
    QT_ENSURE_PARSED(this);
    QT_ENSURE_PARSED(&other);

    if (d->protocol == QAbstractSocket::IPv4Protocol)
        return other.d->protocol == QAbstractSocket::IPv4Protocol && d->a == other.d->a;
    if (d->protocol == QAbstractSocket::IPv6Protocol) {
        return other.d->protocol == QAbstractSocket::IPv6Protocol
               && memcmp(&d->a6, &other.d->a6, sizeof(Q_IPV6ADDR)) == 0;
    }
    return d->protocol == other.d->protocol;
}

bool QHostAddress::operator ==(SpecialAddress other) const
{
    QT_ENSURE_PARSED(this);
    QHostAddress otherAddress(other);
    QT_ENSURE_PARSED(&otherAddress);

    if (d->protocol == QAbstractSocket::IPv4Protocol)
        return otherAddress.d->protocol == QAbstractSocket::IPv4Protocol && d->a == otherAddress.d->a;
    if (d->protocol == QAbstractSocket::IPv6Protocol) {
        return otherAddress.d->protocol == QAbstractSocket::IPv6Protocol
               && memcmp(&d->a6, &otherAddress.d->a6, sizeof(Q_IPV6ADDR)) == 0;
    }
    return int(other) == int(Null);
}

bool QHostAddress::isNull() const
{
    QT_ENSURE_PARSED(this);
    return d->protocol == QAbstractSocket::UnknownNetworkLayerProtocol;
}

bool QHostAddress::isInSubnet(const QHostAddress &subnet, int netmask) const
{
    QT_ENSURE_PARSED(this);
    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 == QAbstractSocket::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 == QAbstractSocket::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;

    int slash = subnet.indexOf(QLatin1Char('/'));
    QString netStr = subnet;
    if (slash != -1)
        netStr.truncate(slash);

    int netmask = -1;
    bool isIpv6 = netStr.contains(QLatin1Char(':'));

    if (slash != -1) {
        // is the netmask given in IP-form or in bit-count form?
        if (!isIpv6 && subnet.indexOf(QLatin1Char('.'), slash + 1) != -1) {
            // IP-style, convert it to bit-count form
            QNetmaskAddress parser;
            if (!parser.setAddress(subnet.mid(slash + 1)))
                return invalid;
            netmask = parser.prefixLength();
        } else {
            bool ok;
            netmask = 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))
            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
    QStringList parts = netStr.split(QLatin1Char('.'));
    if (parts.isEmpty() || parts.count() > 4)
        return invalid;         // invalid IPv4 address

    if (parts.last().isEmpty())
        parts.removeLast();

    quint32 addr = 0;
    for (int i = 0; i < parts.count(); ++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.count());
    if (netmask == -1) {
        netmask = 8 * parts.count();
    } 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);
}

#ifndef QT_NO_DEBUG_STREAM
QDebug operator<<(QDebug d, const QHostAddress &address)
{
    d.maybeSpace() << "QHostAddress(" << address.toString() << ')';
    return d.space();
}
#endif

uint qHash(const QHostAddress &key)
{
    return qHash(key.toString());
}

#ifndef QT_NO_DATASTREAM

QDataStream &operator<<(QDataStream &out, const QHostAddress &address)
{
    qint8 prot;
    prot = qint8(address.protocol());
    out << prot;
    switch (address.protocol()) {
    case QAbstractSocket::UnknownNetworkLayerProtocol:
        break;
    case QAbstractSocket::IPv4Protocol:
        out << address.toIPv4Address();
        break;
    case QAbstractSocket::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 (QAbstractSocket::NetworkLayerProtocol(prot)) {
    case QAbstractSocket::UnknownNetworkLayerProtocol:
        address.clear();
        break;
    case QAbstractSocket::IPv4Protocol:
    {
        quint32 ipv4;
        in >> ipv4;
        address.setAddress(ipv4);
    }
        break;
    case QAbstractSocket::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;
    default:
        address.clear();
        in.setStatus(QDataStream::ReadCorruptData);
    }
    return in;
}

#endif //QT_NO_DATASTREAM

QT_END_NAMESPACE