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feat: Delay M-SEARCH response by a random value according to MX header (#844)

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This commit is contained in:
Murat Seker
2020-06-28 23:19:06 +02:00
committed by GitHub
parent 458113f8f9
commit db8b872217
3 changed files with 36 additions and 32 deletions
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15
libsrc/ssdp/SSDPDiscover.cpp
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@@ -12,7 +12,7 @@ static const quint16 SSDP_PORT(1900);
static const QString UPNP_DISCOVER_MESSAGE = "M-SEARCH * HTTP/1.1\r\n"
"HOST: 239.255.255.250:1900\r\n"
"MAN: \"ssdp:discover\"\r\n"
"MX: 1\r\n"
"MX: 1\r\n"
"ST: %1\r\n"
"\r\n";
@@ -49,7 +49,6 @@ const QString SSDPDiscover::getFirstService(const searchType& type, const QStrin
QByteArray datagram;
while (_udpSocket->hasPendingDatagrams())
{
datagram.resize(_udpSocket->pendingDatagramSize());
QHostAddress sender;
quint16 senderPort;
@@ -163,13 +162,15 @@ void SSDPDiscover::readPendingDatagrams()
if(entry.contains("HTTP/1.1"))
continue;
// split into key:vale, be aware that value field may contain also a ":"
// split into key:value, be aware that value field may contain also a ":"
entry = entry.simplified();
int pos = entry.indexOf(":");
if(pos == -1)
continue;
headers[entry.left(pos).trimmed().toLower()] = entry.mid(pos+1).trimmed();
const QString key = entry.left(pos).trimmed().toLower();
const QString value = entry.mid(pos + 1).trimmed();
headers[key] = value;
}
// verify ssdp spec
@@ -185,7 +186,7 @@ void SSDPDiscover::readPendingDatagrams()
_usnList << headers.value("usn");
//Debug(_log, "Received msearch response from '%s:%d'. Search target: %s",QSTRING_CSTR(sender.toString()), senderPort, QSTRING_CSTR(headers.value("st")));
QUrl url(headers.value("location"));
emit newService(url.host()+":"+QString::number(url.port()));
emit newService(url.host() + ":" + QString::number(url.port()));
}
}
}
@@ -194,7 +195,5 @@ void SSDPDiscover::sendSearch(const QString& st)
{
const QString msg = UPNP_DISCOVER_MESSAGE.arg(st);
_udpSocket->writeDatagram(msg.toUtf8(),
QHostAddress(SSDP_ADDR),
SSDP_PORT);
_udpSocket->writeDatagram(msg.toUtf8(), QHostAddress(SSDP_ADDR), SSDP_PORT);
}