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Allow client to bind on a random port

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This commit is contained in:
Stanislas Michalak 2020-04-19 23:51:33 +02:00
parent bba56fc988
commit 4efe081084
1 changed files with 25 additions and 13 deletions
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38
src/socket.cpp
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@ -54,23 +54,35 @@ void CSocket::Init ( const quint16 iPortNumber )
if ( bIsClient ) if ( bIsClient )
{ {
// Per definition use the port number plus ten for the client to make if (iPortNumber == 0)
// it possible to run server and client on the same computer. If the
// port is not available, try "NUM_SOCKET_PORTS_TO_TRY" times with
// incremented port numbers
quint16 iClientPortIncrement = 10; // start value: port nubmer plus ten
bSuccess = false; // initialization for while loop
while ( !bSuccess &&
( iClientPortIncrement <= NUM_SOCKET_PORTS_TO_TRY ) )
{ {
UdpSocketInAddr.sin_port = htons ( iPortNumber + iClientPortIncrement ); // If port number is 0, bind the client to a random available port.
UdpSocketInAddr.sin_port = htons ( iPortNumber );
bSuccess = ( ::bind ( UdpSocket , bSuccess = ( ::bind ( UdpSocket ,
(sockaddr*) &UdpSocketInAddr, (sockaddr*) &UdpSocketInAddr,
sizeof ( sockaddr_in ) ) == 0 ); sizeof ( sockaddr_in ) ) == 0 );
}
else
{
// Per definition use the port number plus ten for the client to make
// it possible to run server and client on the same computer. If the
// port is not available, try "NUM_SOCKET_PORTS_TO_TRY" times with
// incremented port numbers
quint16 iClientPortIncrement = 10; // start value: port nubmer plus ten
bSuccess = false; // initialization for while loop
iClientPortIncrement++; while ( !bSuccess &&
( iClientPortIncrement <= NUM_SOCKET_PORTS_TO_TRY ) )
{
UdpSocketInAddr.sin_port = htons ( iPortNumber + iClientPortIncrement );
bSuccess = ( ::bind ( UdpSocket ,
(sockaddr*) &UdpSocketInAddr,
sizeof ( sockaddr_in ) ) == 0 );
iClientPortIncrement++;
}
} }
} }
else else