groupsock/include/GroupsockHelper.hh

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/**********
This library is free software; you can redistribute it and/or modify it under
the terms of the GNU Lesser General Public License as published by the
Free Software Foundation; either version 2.1 of the License, or (at your
option) any later version. (See <http://www.gnu.org/copyleft/lesser.html>.)

This library is distributed in the hope that it will be useful, but WITHOUT
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public License for
more details.

You should have received a copy of the GNU Lesser General Public License
along with this library; if not, write to the Free Software Foundation, Inc.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301  USA
**********/
// "mTunnel" multicast access service
// Copyright (c) 1996-2008 Live Networks, Inc.  All rights reserved.
// Helper routines to implement 'group sockets'
// C++ header

#ifndef _GROUPSOCK_HELPER_HH
#define _GROUPSOCK_HELPER_HH

#ifndef _NET_ADDRESS_HH
#include "NetAddress.hh"
#endif

int setupDatagramSocket(UsageEnvironment& env,
                        Port port, Boolean setLoopback = True);
int setupStreamSocket(UsageEnvironment& env,
                      Port port, Boolean makeNonBlocking = True);

int readSocket(UsageEnvironment& env,
               int socket, unsigned char* buffer, unsigned bufferSize,
               struct sockaddr_in& fromAddress,
               struct timeval* timeout = NULL);

int readSocketExact(UsageEnvironment& env,
                    int socket, unsigned char* buffer, unsigned bufferSize,
                    struct sockaddr_in& fromAddress,
                    struct timeval* timeout = NULL);
    // like "readSocket()", except that it rereads as many times as needed until
    // *exactly* "bufferSize" bytes are read.

Boolean writeSocket(UsageEnvironment& env,
                    int socket, struct in_addr address, Port port,
                    u_int8_t ttlArg,
                    unsigned char* buffer, unsigned bufferSize);

unsigned getSendBufferSize(UsageEnvironment& env, int socket);
unsigned getReceiveBufferSize(UsageEnvironment& env, int socket);
unsigned setSendBufferTo(UsageEnvironment& env,
                         int socket, unsigned requestedSize);
unsigned setReceiveBufferTo(UsageEnvironment& env,
                            int socket, unsigned requestedSize);
unsigned increaseSendBufferTo(UsageEnvironment& env,
                              int socket, unsigned requestedSize);
unsigned increaseReceiveBufferTo(UsageEnvironment& env,
                                 int socket, unsigned requestedSize);

Boolean makeSocketNonBlocking(int sock);

Boolean socketJoinGroup(UsageEnvironment& env, int socket,
                        netAddressBits groupAddress);
Boolean socketLeaveGroup(UsageEnvironment&, int socket,
                         netAddressBits groupAddress);

// source-specific multicast join/leave
Boolean socketJoinGroupSSM(UsageEnvironment& env, int socket,
                           netAddressBits groupAddress,
                           netAddressBits sourceFilterAddr);
Boolean socketLeaveGroupSSM(UsageEnvironment&, int socket,
                            netAddressBits groupAddress,
                            netAddressBits sourceFilterAddr);

Boolean getSourcePort(UsageEnvironment& env, int socket, Port& port);

netAddressBits ourIPAddress(UsageEnvironment& env); // in network order

// IP addresses of our sending and receiving interfaces.  (By default, these
// are INADDR_ANY (i.e., 0), specifying the default interface.)
extern netAddressBits SendingInterfaceAddr;
extern netAddressBits ReceivingInterfaceAddr;

// Allocates a randomly-chosen IPv4 SSM (multicast) address:
netAddressBits chooseRandomIPv4SSMAddress(UsageEnvironment& env);

// Returns a simple "hh:mm:ss" string, for use in debugging output (e.g.)
char const* timestampString();


#ifdef HAVE_SOCKADDR_LEN
#define SET_SOCKADDR_SIN_LEN(var) var.sin_len = sizeof var
#else
#define SET_SOCKADDR_SIN_LEN(var)
#endif

#define MAKE_SOCKADDR_IN(var,adr,prt) /*adr,prt must be in network order*/\
    struct sockaddr_in var;\
    var.sin_family = AF_INET;\
    var.sin_addr.s_addr = (adr);\
    var.sin_port = (prt);\
    SET_SOCKADDR_SIN_LEN(var);


// By default, we create sockets with the SO_REUSE_* flag set.
// If, instead, you want to create sockets without the SO_REUSE_* flags,
// Then enclose the creation code with:
//          {
//            NoReuse dummy;
//            ...
//          }
class NoReuse {
public:
  NoReuse();
  ~NoReuse();
};


#if (defined(__WIN32__) || defined(_WIN32)) && !defined(IMN_PIM)
// For Windoze, we need to implement our own gettimeofday()
extern int gettimeofday(struct timeval*, int*);
#endif

// The following are implemented in inet.c:
extern "C" netAddressBits our_inet_addr(char const*);
extern "C" char* our_inet_ntoa(struct in_addr);
extern "C" struct hostent* our_gethostbyname(char* name);
extern "C" void our_srandom(int x);
extern "C" long our_random();
extern "C" u_int32_t our_random32(); // because "our_random()" returns a 31-bit number

#endif

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