feedc0de/qt-creator
1
0
Fork 0
forked from qt-creator/qt-creator
Code Pull Requests Activity

RemoteLinux: Relax port gathering

Browse Source 
We might encounter the situation that protocol is given as IPv6
but the consumer of the free port information decides to open
an IPv4(only) port. As a result the next IPv6 scan will
report the port again as open (in IPv6 namespace), while the
same port in IPv4 namespace might still be blocked, and
re-use of this port fails.

Err on the safe side, and consider ports taken in either space
as blocked.

Change-Id: I2e4be40ab4df5398e26e197c12408efe905b1a2f
Reviewed-by: Christian Kandeler <christian.kandeler@theqtcompany.com>
This commit is contained in:
hjk
2016-04-15 12:23:23 +02:00
parent a24ce30425
commit b7fabb290b
1 changed files with 13 additions and 14 deletions
Download Patch File Download Diff File Expand all files Collapse all files

27
src/plugins/remotelinux/linuxdevice.cpp
View File

@@ -123,27 +123,26 @@ class LinuxPortsGatheringMethod : public PortsGatheringMethod
{
QByteArray commandLine(QAbstractSocket::NetworkLayerProtocol protocol) const
{
QString procFilePath;
int addressLength;
if (protocol == QAbstractSocket::IPv4Protocol) {
procFilePath = QLatin1String("/proc/net/tcp");
addressLength = 8;
} else {
procFilePath = QLatin1String("/proc/net/tcp6");
addressLength = 32;
}
return QString::fromLatin1("sed "
"'s/.*: [[:xdigit:]]\\{%1\\}:\\([[:xdigit:]]\\{4\\}\\).*/\\1/g' %2")
.arg(addressLength).arg(procFilePath).toUtf8();
// We might encounter the situation that protocol is given IPv6
// but the consumer of the free port information decides to open
// an IPv4(only) port. As a result the next IPv6 scan will
// report the port again as open (in IPv6 namespace), while the
// same port in IPv4 namespace might still be blocked, and
// re-use of this port fails.
// GDBserver behaves exactly like this.
Q_UNUSED(protocol)
// /proc/net/tcp* covers /proc/net/tcp and /proc/net/tcp6
return "sed -e 's/.*: [[:xdigit:]]*:\\([[:xdigit:]]\\{4\\}\\).*/\\1/g' /proc/net/tcp*";
}
QList<int> usedPorts(const QByteArray &output) const
{
QList<int> ports;
QList<QByteArray> portStrings = output.split('\n');
portStrings.removeFirst();
foreach (const QByteArray &portString, portStrings) {
if (portString.isEmpty())
if (portString.size() != 4)
continue;
bool ok;
const int port = portString.toInt(&ok, 16);