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QNetworkInterface: add a Linux backend directly using AF_NETLINK

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This allows us a lot greater detail in getting information than relying
on getifaddrs() function. It is also the only way of getting some extra
information we'll need in the future, like address lifetimes.

The parser will also be helpful if we want to add a network interface
monitor in the future, though I currently have no clue how to do the
equivalent on macOS and Windows.

This commit does not remove the support for getifaddrs() on Linux, but I
will no longer add features to it. Note that Android does not support
getifaddrs(), so this may be an improvement if AF_NETLINK works there.

Change-Id: I3868166e5efc45538544fffd14d8e6f993e1eb91
Reviewed-by: Timur Pocheptsov <timur.pocheptsov@qt.io>
Reviewed-by: Edward Welbourne <edward.welbourne@qt.io>
This commit is contained in:
Thiago Macieira 2017-08-08 08:00:35 -07:00
parent 16b76456be
commit 4d31fc919b
5 changed files with 495 additions and 38 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

28
src/network/configure.json
View File

@ -116,6 +116,24 @@
},
"use": "network"
},
"linux-netlink": {
"label": "Linux AF_NETLINK sockets",
"type": "compile",
"test": {
"include": [ "asm/types.h", "linux/netlink.h", "linux/rtnetlink.h", "sys/socket.h" ],
"main": [
"struct rtattr rta = { };",
"struct ifinfomsg ifi = {};",
"struct ifaddrmsg ifa = {};",
"struct ifa_cacheinfo ci;",
"ci.ifa_prefered = ci.ifa_valid = 0;",
"(void)RTM_NEWLINK; (void)RTM_NEWADDR;",
"(void)IFLA_ADDRESS; (void)IFLA_IFNAME;",
"(void)IFA_ADDRESS; (void)IFA_LABEL; (void)IFA_CACHEINFO;",
"(void)(IFA_F_SECONDARY | IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_MANAGETEMPADDR);"
]
}
},
"sctp": {
"label": "SCTP support",
"type": "compile",
@ -161,6 +179,11 @@
"condition": "libs.libproxy",
"output": [ "privateFeature" ]
},
"linux-netlink": {
"label": "Linux AF_NETLINK",
"condition": "config.linux && tests.linux-netlink",
"output": [ "privateFeature" ]
},
"openssl": {
"label": "OpenSSL",
"enable": "input.openssl == 'yes' || input.openssl == 'linked' || input.openssl == 'runtime'",
@ -308,6 +331,11 @@ For example:
"condition": "config.darwin"
},
"getifaddrs", "ipv6ifname", "libproxy",
{
"type": "feature",
"args": "linux-netlink",
"condition": "config.linux"
},
{
"type": "feature",
"args": "securetransport",

6
src/network/kernel/kernel.pri
View File

@ -17,6 +17,7 @@ HEADERS += kernel/qtnetworkglobal.h \
kernel/qnetworkdatagram_p.h \
kernel/qnetworkinterface.h \
kernel/qnetworkinterface_p.h \
kernel/qnetworkinterface_unix_p.h \
kernel/qnetworkproxy.h
SOURCES += kernel/qauthenticator.cpp \
@ -34,7 +35,10 @@ qtConfig(ftp) {
unix {
!integrity: SOURCES += kernel/qdnslookup_unix.cpp
SOURCES += kernel/qhostinfo_unix.cpp kernel/qnetworkinterface_unix.cpp
SOURCES += kernel/qhostinfo_unix.cpp
qtConfig(linux-netlink): SOURCES += kernel/qnetworkinterface_linux.cpp
else: SOURCES += kernel/qnetworkinterface_unix.cpp
}
android {

359
src/network/kernel/qnetworkinterface_linux.cpp Normal file
View File

@ -0,0 +1,359 @@
/****************************************************************************
**
** Copyright (C) 2017 Intel Corporation.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the QtNetwork module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/contact-us.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 3 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL3 included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 3 requirements
** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 2.0 or (at your option) the GNU General
** Public license version 3 or any later version approved by the KDE Free
** Qt Foundation. The licenses are as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
** included in the packaging of this file. Please review the following
** information to ensure the GNU General Public License requirements will
** be met: https://www.gnu.org/licenses/gpl-2.0.html and
** https://www.gnu.org/licenses/gpl-3.0.html.
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include "qnetworkinterface.h"
#include "qnetworkinterface_p.h"
#include "qnetworkinterface_unix_p.h"
#include <qendian.h>
#include <qobjectdefs.h>
#include <qvarlengtharray.h>
// accordding to rtnetlink(7)
#include <asm/types.h>
#include <linux/if.h>
#include <linux/netlink.h>
#include <linux/rtnetlink.h>
#include <sys/socket.h>
QT_BEGIN_NAMESPACE
enum {
BufferSize = 8192
};
namespace {
struct NetlinkSocket
{
int sock;
NetlinkSocket(int bufferSize)
{
sock = qt_safe_socket(AF_NETLINK, SOCK_DGRAM, NETLINK_ROUTE);
if (Q_UNLIKELY(sock == -1))
qErrnoWarning("Could not create AF_NETLINK socket");
// set buffer length
socklen_t len = sizeof(bufferSize);
setsockopt(sock, SOL_SOCKET, SO_SNDBUF, &bufferSize, len);
}
~NetlinkSocket()
{
if (sock != -1)
qt_safe_close(sock);
}
operator int() const { return sock; }
};
template <typename Lambda> struct ProcessNetlinkRequest
{
using FunctionTraits = QtPrivate::FunctionPointer<decltype(&Lambda::operator())>;
using FirstArgument = typename FunctionTraits::Arguments::Car;
static int expectedTypeForRequest(int rtype)
{
Q_STATIC_ASSERT(RTM_NEWADDR == RTM_GETADDR - 2);
Q_STATIC_ASSERT(RTM_NEWLINK == RTM_GETLINK - 2);
Q_ASSERT(rtype == RTM_GETADDR || rtype == RTM_GETLINK);
return rtype - 2;
}
void operator()(int sock, nlmsghdr *hdr, char *buf, size_t bufsize, Lambda &&func)
{
// send the request
if (send(sock, hdr, hdr->nlmsg_len, 0) != hdr->nlmsg_len)
return;
// receive and parse the request
int expectedType = expectedTypeForRequest(hdr->nlmsg_type);
const bool isDump = hdr->nlmsg_flags & NLM_F_DUMP;
forever {
qssize_t len = recv(sock, buf, bufsize, 0);
hdr = reinterpret_cast<struct nlmsghdr *>(buf);
if (!NLMSG_OK(hdr, len))
return;
auto arg = reinterpret_cast<FirstArgument>(NLMSG_DATA(hdr));
size_t payloadLen = NLMSG_PAYLOAD(hdr, 0);
// is this a multipart message?
Q_ASSERT(isDump == !!(hdr->nlmsg_flags & NLM_F_MULTI));
if (!isDump) {
// no, single message
if (hdr->nlmsg_type == expectedType && payloadLen >= sizeof(FirstArgument))
return void(func(arg, payloadLen));
} else {
// multipart, parse until done
do {
if (hdr->nlmsg_type == NLMSG_DONE)
return;
if (hdr->nlmsg_type != expectedType || payloadLen < sizeof(FirstArgument))
break;
func(arg, payloadLen);
// NLMSG_NEXT also updates the len variable
hdr = NLMSG_NEXT(hdr, len);
arg = reinterpret_cast<FirstArgument>(NLMSG_DATA(hdr));
payloadLen = NLMSG_PAYLOAD(hdr, 0);
} while (NLMSG_OK(hdr, len));
if (len == 0)
continue; // get new datagram
}
#ifndef QT_NO_DEBUG
if (NLMSG_OK(hdr, len))
qWarning("QNetworkInterface/AF_NETLINK: received unknown packet type (%d) or too short (%u)",
hdr->nlmsg_type, hdr->nlmsg_len);
else
qWarning("QNetworkInterface/AF_NETLINK: received invalid packet with size %d", int(len));
#endif
return;
}
}
};
template <typename Lambda>
void processNetlinkRequest(int sock, struct nlmsghdr *hdr, char *buf, size_t bufsize, Lambda &&l)
{
ProcessNetlinkRequest<Lambda>()(sock, hdr, buf, bufsize, std::forward<Lambda>(l));
}
}
uint QNetworkInterfaceManager::interfaceIndexFromName(const QString &name)
{
uint index = 0;
if (name.length() >= IFNAMSIZ)
return index;
int socket = qt_safe_socket(AF_INET, SOCK_DGRAM, 0);
if (socket >= 0) {
struct ifreq req;
req.ifr_ifindex = 0;
strcpy(req.ifr_name, name.toLatin1().constData());
if (qt_safe_ioctl(socket, SIOCGIFINDEX, &req) >= 0)
index = req.ifr_ifindex;
qt_safe_close(socket);
}
return index;
}
QString QNetworkInterfaceManager::interfaceNameFromIndex(uint index)
{
int socket = qt_safe_socket(AF_INET, SOCK_DGRAM, 0);
if (socket >= 0) {
struct ifreq req;
req.ifr_ifindex = index;
if (qt_safe_ioctl(socket, SIOCGIFNAME, &req) >= 0) {
qt_safe_close(socket);
return QString::fromLatin1(req.ifr_name);
}
qt_safe_close(socket);
}
return QString();
}
static QList<QNetworkInterfacePrivate *> getInterfaces(int sock, char *buf)
{
QList<QNetworkInterfacePrivate *> result;
// request all links
struct {
struct nlmsghdr req;
struct ifinfomsg ifi;
} ifi_req;
memset(&ifi_req, 0, sizeof(ifi_req));
ifi_req.req.nlmsg_len = sizeof(ifi_req);
ifi_req.req.nlmsg_flags = NLM_F_REQUEST | NLM_F_DUMP;
ifi_req.req.nlmsg_type = RTM_GETLINK;
// parse the interfaces
processNetlinkRequest(sock, &ifi_req.req, buf, BufferSize, [&](ifinfomsg *ifi, size_t len) {
auto iface = new QNetworkInterfacePrivate;
iface->index = ifi->ifi_index;
iface->flags = convertFlags(ifi->ifi_flags);
// read attributes
auto rta = reinterpret_cast<struct rtattr *>(ifi + 1);
len -= sizeof(*ifi);
for ( ; RTA_OK(rta, len); rta = RTA_NEXT(rta, len)) {
int payloadLen = RTA_PAYLOAD(rta);
auto payloadPtr = reinterpret_cast<char *>(RTA_DATA(rta));
switch (rta->rta_type) {
case IFLA_ADDRESS: // link-level address
iface->hardwareAddress =
iface->makeHwAddress(payloadLen, reinterpret_cast<uchar *>(payloadPtr));
break;
case IFLA_IFNAME: // interface name
iface->name = QString::fromLatin1(payloadPtr, payloadLen - 1);
break;
case IFLA_OPERSTATE: // operational state
if (*payloadPtr != IF_OPER_UNKNOWN) {
// override the flag
iface->flags &= ~QNetworkInterface::IsUp;
if (*payloadPtr == IF_OPER_UP)
iface->flags |= QNetworkInterface::IsUp;
}
break;
}
}
if (Q_UNLIKELY(iface->name.isEmpty())) {
qWarning("QNetworkInterface: found interface %d with no name", iface->index);
delete iface;
} else {
result.append(iface);
}
});
return result;
}
static void getAddresses(int sock, char *buf, QList<QNetworkInterfacePrivate *> &result)
{
// request all addresses
struct {
struct nlmsghdr req;
struct ifaddrmsg ifa;
} ifa_req;
memset(&ifa_req, 0, sizeof(ifa_req));
ifa_req.req.nlmsg_len = sizeof(ifa_req);
ifa_req.req.nlmsg_flags = NLM_F_REQUEST | NLM_F_DUMP;
ifa_req.req.nlmsg_type = RTM_GETADDR;
ifa_req.req.nlmsg_seq = 1;
// parse the addresses
processNetlinkRequest(sock, &ifa_req.req, buf, BufferSize, [&](ifaddrmsg *ifa, size_t len) {
if (Q_UNLIKELY(ifa->ifa_family != AF_INET && ifa->ifa_family != AF_INET6)) {
// unknown address types
return;
}
// find the interface this is relevant to
QNetworkInterfacePrivate *iface = nullptr;
for (auto candidate : qAsConst(result)) {
if (candidate->index != int(ifa->ifa_index))
continue;
iface = candidate;
break;
}
if (Q_UNLIKELY(!iface)) {
qWarning("QNetworkInterface/AF_NETLINK: found unknown interface with index %d", ifa->ifa_index);
return;
}
QNetworkAddressEntry entry;
quint32 flags = ifa->ifa_flags; // may be overwritten by IFA_FLAGS
auto makeAddress = [=](uchar *ptr, int len) {
QHostAddress addr;
if (ifa->ifa_family == AF_INET) {
Q_ASSERT(len == 4);
addr.setAddress(qFromBigEndian<quint32>(ptr));
} else {
Q_ASSERT(len == 16);
addr.setAddress(ptr);
// do we need a scope ID?
if (addr.isLinkLocal())
addr.setScopeId(iface->name);
}
return addr;
};
// read attributes
auto rta = reinterpret_cast<struct rtattr *>(ifa + 1);
len -= sizeof(*ifa);
for ( ; RTA_OK(rta, len); rta = RTA_NEXT(rta, len)) {
int payloadLen = RTA_PAYLOAD(rta);
auto payloadPtr = reinterpret_cast<uchar *>(RTA_DATA(rta));
switch (rta->rta_type) {
case IFA_ADDRESS: // address
entry.setIp(makeAddress(payloadPtr, payloadLen));
break;
case IFA_BROADCAST:
Q_ASSERT(ifa->ifa_family == AF_INET);
entry.setBroadcast(makeAddress(payloadPtr, payloadLen));
break;
case IFA_FLAGS:
Q_ASSERT(payloadLen == 4);
flags = qFromUnaligned<quint32>(payloadPtr);
break;
}
}
// now handle flags
Q_UNUSED(flags);
if (!entry.ip().isNull()) {
entry.setPrefixLength(ifa->ifa_prefixlen);
iface->addressEntries.append(entry);
}
});
}
QList<QNetworkInterfacePrivate *> QNetworkInterfaceManager::scan()
{
// open netlink socket
QList<QNetworkInterfacePrivate *> result;
NetlinkSocket sock(BufferSize);
if (Q_UNLIKELY(sock == -1))
return result;
QByteArray buffer(BufferSize, Qt::Uninitialized);
char *buf = buffer.data();
result = getInterfaces(sock, buf);
getAddresses(sock, buf, result);
return result;
}
QT_END_NAMESPACE

38
src/network/kernel/qnetworkinterface_unix.cpp
View File

@ -41,34 +41,15 @@
#include "qset.h"
#include "qnetworkinterface.h"
#include "qnetworkinterface_p.h"
#include "qnetworkinterface_unix_p.h"
#include "qalgorithms.h"
#include "private/qnet_unix_p.h"
#ifndef QT_NO_NETWORKINTERFACE
#define IP_MULTICAST // make AIX happy and define IFF_MULTICAST
#include <sys/types.h>
#include <sys/socket.h>
#ifdef Q_OS_SOLARIS
# include <sys/sockio.h>
#endif
#include <net/if.h>
#ifndef QT_NO_IPV6IFNAME
#include <net/if.h>
#endif
#if defined(QT_LINUXBASE)
# define QT_NO_GETIFADDRS
#endif
#ifdef Q_OS_HAIKU
# include <sys/sockio.h>
# define IFF_RUNNING 0x0001
#endif
#ifndef QT_NO_GETIFADDRS
# include <ifaddrs.h>
#endif
@ -107,23 +88,6 @@ static QHostAddress addressFromSockaddr(sockaddr *sa, int ifindex = 0, const QSt
}
static QNetworkInterface::InterfaceFlags convertFlags(uint rawFlags)
{
QNetworkInterface::InterfaceFlags flags = 0;
flags |= (rawFlags & IFF_UP) ? QNetworkInterface::IsUp : QNetworkInterface::InterfaceFlag(0);
flags |= (rawFlags & IFF_RUNNING) ? QNetworkInterface::IsRunning : QNetworkInterface::InterfaceFlag(0);
flags |= (rawFlags & IFF_BROADCAST) ? QNetworkInterface::CanBroadcast : QNetworkInterface::InterfaceFlag(0);
flags |= (rawFlags & IFF_LOOPBACK) ? QNetworkInterface::IsLoopBack : QNetworkInterface::InterfaceFlag(0);
#ifdef IFF_POINTOPOINT //cygwin doesn't define IFF_POINTOPOINT
flags |= (rawFlags & IFF_POINTOPOINT) ? QNetworkInterface::IsPointToPoint : QNetworkInterface::InterfaceFlag(0);
#endif
#ifdef IFF_MULTICAST
flags |= (rawFlags & IFF_MULTICAST) ? QNetworkInterface::CanMulticast : QNetworkInterface::InterfaceFlag(0);
#endif
return flags;
}
uint QNetworkInterfaceManager::interfaceIndexFromName(const QString &name)
{
#ifndef QT_NO_IPV6IFNAME

102
src/network/kernel/qnetworkinterface_unix_p.h Normal file
View File

@ -0,0 +1,102 @@
/****************************************************************************
**
** Copyright (C) 2017 The Qt Company Ltd.
** Copyright (C) 2017 Intel Corporation.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the QtNetwork module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/contact-us.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 3 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL3 included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 3 requirements
** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 2.0 or (at your option) the GNU General
** Public license version 3 or any later version approved by the KDE Free
** Qt Foundation. The licenses are as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
** included in the packaging of this file. Please review the following
** information to ensure the GNU General Public License requirements will
** be met: https://www.gnu.org/licenses/gpl-2.0.html and
** https://www.gnu.org/licenses/gpl-3.0.html.
**
** $QT_END_LICENSE$
**
****************************************************************************/
#ifndef QNETWORKINTERFACE_UNIX_P_H
#define QNETWORKINTERFACE_UNIX_P_H
//
// W A R N I N G
// -------------
//
// This file is not part of the Qt API. It exists purely as an
// implementation detail. This header file may change from version to
// version without notice, or even be removed.
//
// We mean it.
//
#include "qnetworkinterface_p.h"
#include "private/qnet_unix_p.h"
#ifndef QT_NO_NETWORKINTERFACE
#define IP_MULTICAST // make AIX happy and define IFF_MULTICAST
#include <sys/types.h>
#include <sys/socket.h>
#ifdef Q_OS_SOLARIS
# include <sys/sockio.h>
#endif
#ifdef Q_OS_HAIKU
# include <sys/sockio.h>
# define IFF_RUNNING 0x0001
#endif
#if QT_CONFIG(linux_netlink)
// Same as net/if.h but contains other things we need in
// qnetworkinterface_linux.cpp.
# include <linux/if.h>
#else
# include <net/if.h>
#endif
QT_BEGIN_NAMESPACE
static QNetworkInterface::InterfaceFlags convertFlags(uint rawFlags)
{
QNetworkInterface::InterfaceFlags flags = 0;
flags |= (rawFlags & IFF_UP) ? QNetworkInterface::IsUp : QNetworkInterface::InterfaceFlag(0);
flags |= (rawFlags & IFF_RUNNING) ? QNetworkInterface::IsRunning : QNetworkInterface::InterfaceFlag(0);
flags |= (rawFlags & IFF_BROADCAST) ? QNetworkInterface::CanBroadcast : QNetworkInterface::InterfaceFlag(0);
flags |= (rawFlags & IFF_LOOPBACK) ? QNetworkInterface::IsLoopBack : QNetworkInterface::InterfaceFlag(0);
#ifdef IFF_POINTOPOINT //cygwin doesn't define IFF_POINTOPOINT
flags |= (rawFlags & IFF_POINTOPOINT) ? QNetworkInterface::IsPointToPoint : QNetworkInterface::InterfaceFlag(0);
#endif
#ifdef IFF_MULTICAST
flags |= (rawFlags & IFF_MULTICAST) ? QNetworkInterface::CanMulticast : QNetworkInterface::InterfaceFlag(0);
#endif
return flags;
}
QT_END_NAMESPACE
#endif // QT_NO_NETWORKINTERFACE
#endif // QNETWORKINTERFACE_UNIX_P_H