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qt6-bb10/src/network/kernel/qhostaddress.cpp

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/****************************************************************************
**
** Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/
**
** This file is part of the QtNetwork module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** GNU Lesser General Public License Usage
** 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 will be met:
** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Nokia gives you certain additional
** rights. These rights are described in the Nokia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU General
** Public License version 3.0 as published by the Free Software Foundation
** and appearing in the file LICENSE.GPL included in the packaging of this
** file. Please review the following information to ensure the GNU General
** Public License version 3.0 requirements will be met:
** http://www.gnu.org/copyleft/gpl.html.
**
** Other Usage
** Alternatively, this file may be used in accordance with the terms and
** conditions contained in a signed written agreement between you and Nokia.
**
**
**
**
**
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include "qhostaddress.h"
#include "qhostaddress_p.h"
#include "private/qipaddress_p.h"
#include "qdebug.h"
#if defined(Q_OS_WIN)
# include <winsock2.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 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
// 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
#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();
QString ipString;
QString scopeId;
quint32 a; // IPv4 address
Q_IPV6ADDR a6; // IPv6 address
QAbstractSocket::NetworkLayerProtocol protocol;
bool isParsed;
friend class QHostAddress;
};
QHostAddressPrivate::QHostAddressPrivate()
: a(0), protocol(QAbstractSocket::UnknownNetworkLayerProtocol), isParsed(true)
{
memset(&a6, 0, sizeof(a6));
}
void QHostAddressPrivate::setAddress(quint32 a_)
{
a = a_;
//create mapped address
memset(&a6, 0, sizeof(a6));
int i;
for (i=15; a_ != 0; i--) {
a6[i] = a_ & 0xFF;
a_ >>=8;
}
Q_ASSERT(i >= 11);
a6[11] = 0xFF;
a6[10] = 0xFF;
protocol = QAbstractSocket::IPv4Protocol;
isParsed = true;
}
static bool parseMappedAddress(quint32& a, const Q_IPV6ADDR &a6)
{
int i;
for (i=0;i<10;i++)
if (a6[i]) return false;
for (;i<12;i++)
if (a6[i] != 0xFF) return false;
a=(a6[12] << 24) | (a6[13] << 16) | (a6[14] << 8) | a6[15];
return true;
}
void QHostAddressPrivate::setAddress(const quint8 *a_)
{
for (int i = 0; i < 16; i++)
a6[i] = a_[i];
a = 0;
if (parseMappedAddress(a, a6))
protocol = QAbstractSocket::IPv4Protocol;
else
protocol = QAbstractSocket::IPv6Protocol;
isParsed = true;
}
void QHostAddressPrivate::setAddress(const Q_IPV6ADDR &a_)
{
a6 = a_;
a = 0;
if (parseMappedAddress(a, a6))
protocol = QAbstractSocket::IPv4Protocol;
else
protocol = QAbstractSocket::IPv6Protocol;
isParsed = true;
}
static bool parseIp6(const QString &address, QIPAddressUtils::IPv6Address &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();
}
return QIPAddressUtils::parseIp6(addr, tmp.constBegin(), tmp.constEnd());
}
bool QHostAddressPrivate::parse()
{
isParsed = true;
protocol = QAbstractSocket::UnknownNetworkLayerProtocol;
QString a = ipString.simplified();
if (a.isEmpty())
return false;
// 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;
}
}
quint32 maybeIp4 = 0;
if (QIPAddressUtils::parseIp4(maybeIp4, a.constBegin(), a.constEnd())) {
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);
}
}
/*!
\class QHostAddress
\brief The QHostAddress class provides an IP address.
\ingroup network
\inmodule QtNetwork
This class holds an IPv4 or IPv6 address in a platform- and
protocol-independent manner.
QHostAddress is normally used with the QTcpSocket, QTcpServer,
and QUdpSocket to connect to a host or to set up a server.
A host address is set with setAddress(), and retrieved with
toIPv4Address(), toIPv6Address(), or toString(). You can check the
type with protocol().
\note Please note that QHostAddress does not do DNS lookups.
QHostInfo is needed for that.
The class also supports common predefined addresses: \l Null, \l
LocalHost, \l LocalHostIPv6, \l Broadcast, and \l Any.
\sa QHostInfo, QTcpSocket, QTcpServer, QUdpSocket
*/
/*! \enum QHostAddress::SpecialAddress
\value Null The null address object. Equivalent to QHostAddress().
\value LocalHost The IPv4 localhost address. Equivalent to QHostAddress("127.0.0.1").
\value LocalHostIPv6 The IPv6 localhost address. Equivalent to QHostAddress("::1").
\value Broadcast The IPv4 broadcast address. Equivalent to QHostAddress("255.255.255.255").
\value AnyIPv4 The IPv4 any-address. Equivalent to QHostAddress("0.0.0.0"). A socket bound with this address will listen only on IPv4 interaces.
\value AnyIPv6 The IPv6 any-address. Equivalent to QHostAddress("::"). A socket bound with this address will listen only on IPv6 interaces.
\value Any The dual stack any-address. A socket bound with this address will listen on both IPv4 and IPv6 interfaces.
*/
/*! Constructs a host address object with the IP address 0.0.0.0.
\sa clear()
*/
QHostAddress::QHostAddress()
: d(new QHostAddressPrivate)
{
}
/*!
Constructs a host address object with the IPv4 address \a ip4Addr.
*/
QHostAddress::QHostAddress(quint32 ip4Addr)
: d(new QHostAddressPrivate)
{
setAddress(ip4Addr);
}
/*!
Constructs a host address object with the IPv6 address \a ip6Addr.
\a ip6Addr must be a 16-byte array in network byte order (big
endian).
*/
QHostAddress::QHostAddress(quint8 *ip6Addr)
: d(new QHostAddressPrivate)
{
setAddress(ip6Addr);
}
/*!
Constructs a host address object with the IPv6 address \a ip6Addr.
*/
QHostAddress::QHostAddress(const Q_IPV6ADDR &ip6Addr)
: d(new QHostAddressPrivate)
{
setAddress(ip6Addr);
}
/*!
Constructs an IPv4 or IPv6 address based on the string \a address
(e.g., "127.0.0.1").
\sa setAddress()
*/
QHostAddress::QHostAddress(const QString &address)
: d(new QHostAddressPrivate)
{
d->ipString = address;
d->isParsed = false;
}
/*!
\fn QHostAddress::QHostAddress(const sockaddr *sockaddr)
Constructs an IPv4 or IPv6 address using the address specified by
the native structure \a sockaddr.
\sa setAddress()
*/
QHostAddress::QHostAddress(const struct sockaddr *sockaddr)
: d(new QHostAddressPrivate)
{
if (sockaddr->sa_family == AF_INET)
setAddress(htonl(((sockaddr_in *)sockaddr)->sin_addr.s_addr));
else if (sockaddr->sa_family == AF_INET6)
setAddress(((qt_sockaddr_in6 *)sockaddr)->sin6_addr.qt_s6_addr);
}
/*!
Constructs a copy of the given \a address.
*/
QHostAddress::QHostAddress(const QHostAddress &address)
: d(new QHostAddressPrivate(*address.d.data()))
{
}
/*!
Constructs a QHostAddress object for \a address.
*/
QHostAddress::QHostAddress(SpecialAddress address)
: d(new QHostAddressPrivate)
{
Q_IPV6ADDR ip6;
memset(&ip6, 0, sizeof ip6);
switch (address) {
case Null:
break;
case Broadcast:
d->setAddress(quint32(-1));
break;
case LocalHost:
d->setAddress(0x7f000001);
break;
case LocalHostIPv6:
ip6[15] = 1;
d->setAddress(ip6);
break;
case AnyIPv4:
setAddress(0u);
break;
case AnyIPv6:
d->setAddress(ip6);
break;
case Any:
d->clear();
d->protocol = QAbstractSocket::AnyIPProtocol;
break;
}
}
/*!
Destroys the host address object.
*/
QHostAddress::~QHostAddress()
{
}
/*!
Assigns another host \a address to this object, and returns a reference
to this object.
*/
QHostAddress &QHostAddress::operator=(const QHostAddress &address)
{
*d.data() = *address.d.data();
return *this;
}
/*!
Assigns the host address \a address to this object, and returns a
reference to this object.
\sa setAddress()
*/
QHostAddress &QHostAddress::operator=(const QString &address)
{
setAddress(address);
return *this;
}
/*!
\fn bool QHostAddress::operator!=(const QHostAddress &other) const
\since 4.2
Returns true if this host address is not the same as the \a other
address given; otherwise returns false.
*/
/*!
\fn bool QHostAddress::operator!=(SpecialAddress other) const
Returns true if this host address is not the same as the \a other
address given; otherwise returns false.
*/
/*!
Sets the host address to 0.0.0.0.
*/
void QHostAddress::clear()
{
d->clear();
}
/*!
Set the IPv4 address specified by \a ip4Addr.
*/
void QHostAddress::setAddress(quint32 ip4Addr)
{
d->setAddress(ip4Addr);
}
/*!
\overload
Set the IPv6 address specified by \a ip6Addr.
\a ip6Addr must be an array of 16 bytes in network byte order
(high-order byte first).
*/
void QHostAddress::setAddress(quint8 *ip6Addr)
{
d->setAddress(ip6Addr);
}
/*!
\overload
Set the IPv6 address specified by \a ip6Addr.
*/
void QHostAddress::setAddress(const Q_IPV6ADDR &ip6Addr)
{
d->setAddress(ip6Addr);
}
/*!
\overload
Sets the IPv4 or IPv6 address specified by the string
representation specified by \a address (e.g. "127.0.0.1").
Returns true and sets the address if the address was successfully
parsed; otherwise returns false.
*/
bool QHostAddress::setAddress(const QString &address)
{
d->ipString = address;
return d->parse();
}
/*!
\fn void QHostAddress::setAddress(const sockaddr *sockaddr)
\overload
Sets the IPv4 or IPv6 address specified by the native structure \a
sockaddr. Returns true and sets the address if the address was
successfully parsed; otherwise returns false.
*/
void QHostAddress::setAddress(const struct sockaddr *sockaddr)
{
clear();
if (sockaddr->sa_family == AF_INET)
setAddress(htonl(((sockaddr_in *)sockaddr)->sin_addr.s_addr));
else if (sockaddr->sa_family == AF_INET6)
setAddress(((qt_sockaddr_in6 *)sockaddr)->sin6_addr.qt_s6_addr);
}
/*!
Returns the IPv4 address as a number.
For example, if the address is 127.0.0.1, the returned value is
2130706433 (i.e. 0x7f000001).
This value is valid if the protocol() is
\l{QAbstractSocket::}{IPv4Protocol},
or if the protocol is
\l{QAbstractSocket::}{IPv6Protocol},
and the IPv6 address is an IPv4 mapped address. (RFC4291)
\sa toString()
*/
quint32 QHostAddress::toIPv4Address() const
{
QT_ENSURE_PARSED(this);
return d->a;
}
/*!
Returns the network layer protocol of the host address.
*/
QAbstractSocket::NetworkLayerProtocol QHostAddress::protocol() const
{
QT_ENSURE_PARSED(this);
return d->protocol;
}
/*!
Returns the IPv6 address as a Q_IPV6ADDR structure. The structure
consists of 16 unsigned characters.
\snippet code/src_network_kernel_qhostaddress.cpp 0
This value is valid if the protocol() is
\l{QAbstractSocket::}{IPv6Protocol}.
If the protocol is
\l{QAbstractSocket::}{IPv4Protocol},
then the address is returned an an IPv4 mapped IPv6 address. (RFC4291)
\sa toString()
*/
Q_IPV6ADDR QHostAddress::toIPv6Address() const
{
QT_ENSURE_PARSED(this);
return d->a6;
}
/*!
Returns the address as a string.
For example, if the address is the IPv4 address 127.0.0.1, the
returned string is "127.0.0.1". For IPv6 the string format will
follow the RFC5952 recommendation.
For QHostAddress::Any, its IPv4 address will be returned ("0.0.0.0")
\sa toIPv4Address()
*/
QString QHostAddress::toString() const
{
QT_ENSURE_PARSED(this);
if (d->protocol == QAbstractSocket::IPv4Protocol
|| d->protocol == QAbstractSocket::AnyIPProtocol) {
quint32 i = toIPv4Address();
QString s;
QIPAddressUtils::toString(s, i);
return s;
}
if (d->protocol == QAbstractSocket::IPv6Protocol) {
QString s;
QIPAddressUtils::toString(s, d->a6.c);
if (!d->scopeId.isEmpty())
s.append(QLatin1Char('%') + d->scopeId);
return s;
}
return QString();
}
/*!
\since 4.1
Returns the scope ID of an IPv6 address. For IPv4 addresses, or if the
address does not contain a scope ID, an empty QString is returned.
The IPv6 scope ID specifies the scope of \e reachability for non-global
IPv6 addresses, limiting the area in which the address can be used. All
IPv6 addresses are associated with such a reachability scope. The scope ID
is used to disambiguate addresses that are not guaranteed to be globally
unique.
IPv6 specifies the following four levels of reachability:
\list
\li Node-local: Addresses that are only used for communicating with
services on the same interface (e.g., the loopback interface "::1").
\li Link-local: Addresses that are local to the network interface
(\e{link}). There is always one link-local address for each IPv6 interface
on your host. Link-local addresses ("fe80...") are generated from the MAC
address of the local network adaptor, and are not guaranteed to be unique.
\li Site-local: Addresses that are local to the site / private network
(e.g., the company intranet). Site-local addresses ("fec0...") are
usually distributed by the site router, and are not guaranteed to be
unique outside of the local site.
\li Global: For globally routable addresses, such as public servers on the
Internet.
\endlist
When using a link-local or site-local address for IPv6 connections, you
must specify the scope ID. The scope ID for a link-local address is
usually the same as the interface name (e.g., "eth0", "en1") or number
(e.g., "1", "2").
\sa setScopeId()
*/
QString QHostAddress::scopeId() const
{
QT_ENSURE_PARSED(this);
return (d->protocol == QAbstractSocket::IPv6Protocol) ? d->scopeId : QString();
}
/*!
\since 4.1
Sets the IPv6 scope ID of the address to \a id. If the address
protocol is not IPv6, this function does nothing.
*/
void QHostAddress::setScopeId(const QString &id)
{
QT_ENSURE_PARSED(this);
if (d->protocol == QAbstractSocket::IPv6Protocol)
d->scopeId = id;
}
/*!
Returns true if this host address is the same as the \a other address
given; otherwise returns false.
*/
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;
}
/*!
Returns true if this host address is the same as the \a other
address given; otherwise returns false.
*/
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;
}
if (d->protocol == QAbstractSocket::AnyIPProtocol)
return other == QHostAddress::Any;
return int(other) == int(Null);
}
/*!
Returns true if this host address is null (INADDR_ANY or in6addr_any).
The default constructor creates a null address, and that address is
not valid for any host or interface.
*/
bool QHostAddress::isNull() const
{
QT_ENSURE_PARSED(this);
return d->protocol == QAbstractSocket::UnknownNetworkLayerProtocol;
}
/*!
\since 4.5
Returns true if this IP is in the subnet described by the network
prefix \a subnet and netmask \a netmask.
An IP is considered to belong to a subnet if it is contained
between the lowest and the highest address in that subnet. In the
case of IP version 4, the lowest address is the network address,
while the highest address is the broadcast address.
The \a subnet argument does not have to be the actual network
address (the lowest address in the subnet). It can be any valid IP
belonging to that subnet. In particular, if it is equal to the IP
address held by this object, this function will always return true
(provided the netmask is a valid value).
\sa parseSubnet()
*/
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);
}
/*!
\since 4.5
\overload
Returns true if this IP is in the subnet described by \a
subnet. The QHostAddress member of \a subnet contains the network
prefix and the int (second) member contains the netmask (prefix
length).
*/
bool QHostAddress::isInSubnet(const QPair<QHostAddress, int> &subnet) const
{
return isInSubnet(subnet.first, subnet.second);
}
/*!
\since 4.5
Parses the IP and subnet information contained in \a subnet and
returns the network prefix for that network and its prefix length.
The IP address and the netmask must be separated by a slash
(/).
This function supports arguments in the form:
\list
\li 123.123.123.123/n where n is any value between 0 and 32
\li 123.123.123.123/255.255.255.255
\li <ipv6-address>/n where n is any value between 0 and 128
\endlist
For IP version 4, this function accepts as well missing trailing
components (i.e., less than 4 octets, like "192.168.1"), followed
or not by a dot. If the netmask is also missing in that case, it
is set to the number of octets actually passed (in the example
above, it would be 24, for 3 octets).
\sa isInSubnet()
*/
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);
}
/*!
\since 5.0
returns true if the address is the IPv6 loopback address, or any
of the IPv4 loopback addresses.
*/
bool QHostAddress::isLoopback() const
{
QT_ENSURE_PARSED(this);
if ((d->a & 0xFF000000) == 0x7F000000)
return true; // v4 range (including IPv6 wrapped IPv4 addresses)
if (d->protocol == QAbstractSocket::IPv6Protocol) {
if (d->a6.c[15] != 1)
return false;
for (int i = 0; i < 15; i++)
if (d->a6[i] != 0)
return false;
return true;
}
return false;
}
#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, uint seed)
{
// both lines might throw
QT_ENSURE_PARSED(&key);
return qHash(QByteArray::fromRawData(reinterpret_cast<const char *>(key.d->a6.c), 16), seed);
}
#ifndef QT_NO_DATASTREAM
/*! \relates QHostAddress
Writes host address \a address to the stream \a out and returns a reference
to the stream.
\sa {Serializing Qt Data Types}
*/
QDataStream &operator<<(QDataStream &out, const QHostAddress &address)
{
qint8 prot;
prot = qint8(address.protocol());
out << prot;
switch (address.protocol()) {
case QAbstractSocket::UnknownNetworkLayerProtocol:
case QAbstractSocket::AnyIPProtocol:
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;
}
/*! \relates QHostAddress
Reads a host address into \a address from the stream \a in and returns a
reference to the stream.
\sa {Serializing Qt Data Types}
*/
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;
case QAbstractSocket::AnyIPProtocol:
address = QHostAddress::Any;
break;
default:
address.clear();
in.setStatus(QDataStream::ReadCorruptData);
}
return in;
}
#endif //QT_NO_DATASTREAM
QT_END_NAMESPACE
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