bool RTPTransport::localAddr(SocketAddr& addr, bool rtcp)
{
// check if sockets are already created and bound
if (m_rtpSock.valid())
return false;
int p = addr.port();
// for RTCP make sure we don't have a port or it's an even one
if (rtcp && (p & 1))
return false;
m_warnSendErrorRtp = true;
m_warnSendErrorRtcp = true;
if (m_rtpSock.create(addr.family(),SOCK_DGRAM) && m_rtpSock.bind(addr)) {
m_rtpSock.setBlocking(false);
if (!rtcp) {
// RTCP not requested - we are done
m_rtpSock.getSockName(addr);
m_localAddr = addr;
setScopeId(m_localAddr,m_remoteAddr,m_remotePref);
return true;
}
if (!p) {
m_rtpSock.getSockName(addr);
p = addr.port();
if (p & 1) {
// allocated odd port - have to swap sockets
m_rtcpSock.attach(m_rtpSock.detach());
addr.port(p-1);
if (m_rtpSock.create(addr.family(),SOCK_DGRAM) && m_rtpSock.bind(addr)) {
m_rtpSock.setBlocking(false);
m_localAddr = addr;
setScopeId(m_localAddr,m_remoteAddr,m_remoteRTCP,&m_remotePref);
return true;
}
DDebug(DebugMild,"RTP Socket failed with code %d",m_rtpSock.error());
m_rtpSock.terminate();
m_rtcpSock.terminate();
return false;
}
}
addr.port(p+1);
if (m_rtcpSock.create(addr.family(),SOCK_DGRAM) && m_rtcpSock.bind(addr)) {
m_rtcpSock.setBlocking(false);
addr.port(p);
m_localAddr = addr;
setScopeId(m_localAddr,m_remoteAddr,m_remoteRTCP,&m_remotePref);
return true;
}
#ifdef DEBUG
else
Debug(DebugMild,"RTCP Socket failed with code %d",m_rtcpSock.error());
#endif
}
#ifdef DEBUG
else
Debug(DebugMild,"RTP Socket failed with code %d",m_rtpSock.error());
#endif
m_rtpSock.terminate();
m_rtcpSock.terminate();
return false;
}
// Set IPv6 sin6_scope_id for remote addresses from local address
// recvFrom() will set the sin6_scope_id of the remote socket address
// This will avoid socket address comparison mismatch (same address, different scope id)
static inline void setScopeId(const SocketAddr& local, SocketAddr& sa1,
SocketAddr& sa2, SocketAddr* sa3 = 0)
{
if (local.family() != SocketAddr::IPv6)
return;
unsigned int val = local.scopeId();
sa1.scopeId(val);
sa2.scopeId(val);
if (sa3)
sa3->scopeId(val);
}
