101 lines
3.4 KiB
C++
101 lines
3.4 KiB
C++
/**
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* Copyright - See the COPYRIGHT that is included with this distribution.
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* pvAccessCPP is distributed subject to a Software License Agreement found
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* in file LICENSE that is included with this distribution.
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*/
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#include <sys/types.h>
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#include <osiSock.h>
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#define epicsExportSharedSymbols
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#include <pv/blockingUDP.h>
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#include <pv/remote.h>
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#include <pv/logger.h>
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using namespace std;
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using namespace epics::pvData;
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namespace {
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struct closer {
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epics::pvAccess::Transport::shared_pointer P;
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closer(const epics::pvAccess::Transport::shared_pointer& P) :P(P) {}
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void operator()(epics::pvAccess::Transport*) {
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try{
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P->close();
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}catch(...){
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P.reset();
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throw;
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}
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P.reset();
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}
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};
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}
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namespace epics {
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namespace pvAccess {
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Transport::shared_pointer BlockingUDPConnector::connect(TransportClient::shared_pointer const & /*client*/,
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ResponseHandler::shared_pointer const & responseHandler, osiSockAddr& bindAddress,
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int8 transportRevision, int16 /*priority*/) {
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LOG(logLevelDebug, "Creating datagram socket to: %s.",
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inetAddressToString(bindAddress).c_str());
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SOCKET socket = epicsSocketCreate(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
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if(socket==INVALID_SOCKET) {
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char errStr[64];
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epicsSocketConvertErrnoToString(errStr, sizeof(errStr));
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LOG(logLevelError, "Error creating socket: %s.", errStr);
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return Transport::shared_pointer();
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}
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int optval = _broadcast ? 1 : 0;
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int retval = ::setsockopt(socket, SOL_SOCKET, SO_BROADCAST, (char *)&optval, sizeof(optval));
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if(retval<0)
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{
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char errStr[64];
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epicsSocketConvertErrnoToString(errStr, sizeof(errStr));
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LOG(logLevelError, "Error setting SO_BROADCAST: %s.", errStr);
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epicsSocketDestroy (socket);
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return Transport::shared_pointer();
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}
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/*
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IPv4 multicast addresses are defined by the leading address bits of 1110,
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originating from the classful network design of the early Internet when this
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group of addresses was designated as Class D. The Classless Inter-Domain Routing (CIDR)
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prefix of this group is 224.0.0.0/4.
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The group includes the addresses from 224.0.0.0 to 239.255.255.255.
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Address assignments from within this range are specified in RFC 5771,
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an Internet Engineering Task Force (IETF) Best Current Practice document (BCP 51).*/
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// set SO_REUSEADDR or SO_REUSEPORT, OS dependant
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if (_reuseSocket)
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epicsSocketEnableAddressUseForDatagramFanout(socket);
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retval = ::bind(socket, (sockaddr*)&(bindAddress.sa), sizeof(sockaddr));
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if(retval<0) {
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char errStr[64];
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epicsSocketConvertErrnoToString(errStr, sizeof(errStr));
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LOG(logLevelError, "Error binding socket: %s.", errStr);
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epicsSocketDestroy (socket);
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return Transport::shared_pointer();
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}
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// sockets are blocking by default
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BlockingUDPTransport::shared_pointer transport(new BlockingUDPTransport(_serverFlag, responseHandler,
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socket, bindAddress, transportRevision));
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// the worker thread holds a strong ref, which is released by transport->close()
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// note: casting to Transport* to prevent iOS version of shared_ptr from trying (and failing)
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// to setup shared_from_this() using the wrapped pointer
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Transport::shared_pointer ret(static_cast<Transport*>(transport.get()), closer(transport));
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return ret;
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}
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}
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}
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