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Merge pull request #115 from stanislas-m/feat/client-random-port

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Allow client to bind on a random port
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corrados 2020-04-20 16:54:48 +02:00 committed by GitHub
commit e305eac01c
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1 changed files with 26 additions and 14 deletions
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40
src/socket.cpp
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@ -54,29 +54,41 @@ 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 ( 0 );
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
{ {
// for the server, only try the given port number and do not try out // for the server, only try the given port number and do not try out
// other port numbers to bind since it is imporatant that the server // other port numbers to bind since it is important that the server
// gets the desired port number // gets the desired port number
UdpSocketInAddr.sin_port = htons ( iPortNumber ); UdpSocketInAddr.sin_port = htons ( iPortNumber );