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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/***************************************************************************
* multicast.cc
*
* Mon Sep 26 12:25:22 CEST 2005
* Copyright 2005 Bent Bisballe Nyeng
* deva@aasimon.org
****************************************************************************/
/*
* This file is part of MIaV.
*
* MIaV is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* MIaV 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with MIaV; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
*/
#include "config.h"
#include "multicast.h"
#include "multicast_configuration.h"
#include "miav_config.h"
#include <sys/socket.h>
#include <netinet/in.h>
#include <netdb.h>
#include <sys/param.h>
#include <arpa/inet.h>
#include <sys/types.h>
#include <string.h>
// For IP_MTU
//#include <linux/in.h>
//#ifndef IP_MTU
//#define IP_MTU 14
//#endif
#include <errno.h>
Multicast::Multicast(Info *i, mcastconf_t &mcclientconf)
{
info = i;
udp_buffer = NULL;
multicast_audio = mcclientconf.with_audio;
// Open connection socket
if(!UDPOpen(mcclientconf.addr.c_str(), mcclientconf.port))
info->error("Error creating socket %s:%d",
mcclientconf.addr.c_str(),
mcclientconf.port);
int mtu = config->readInt("udp_packet_size");
// Create buffer with the size of MTU
// socklen_t mtu_sz;
// if(getsockopt(sock, SOL_IP, IP_MTU, &mtu, &mtu_sz) != -1) {
udp_buffer_size = mtu - 28;
if(udp_buffer_size < 1) udp_buffer_size = 1;
udp_buffer = new char[udp_buffer_size];
udp_buffer_pointer = udp_buffer;
info->info("UDP packet buffer size %db", udp_buffer_size);
//} else {
// info->error("Error getting MTU size from socket: %s", strerror(errno));
// return;
//}
}
Multicast::~Multicast()
{
if(udp_buffer) delete udp_buffer;
}
int Multicast::Write(void* buf, int size)
{
if(!udp_buffer) return 0; // no buffer to write in... better break out!
// info->info("To send: %d", size);
char *p = (char*)buf;
int left = udp_buffer_size - (udp_buffer_pointer - udp_buffer);
while(size) {
int to_copy = size > left ? left : size;
memcpy(udp_buffer_pointer, p, to_copy);
left-=to_copy;
udp_buffer_pointer += to_copy;
p+=to_copy;
size-=to_copy;
// info->info("Copied %d - %d to go", to_copy, size);
if(left == 0) {
// info->info("Sending full packet");
if(write(sock, udp_buffer, udp_buffer_size) != udp_buffer_size) {
info->error("Could not write entire buffer to socket.");
}
left = udp_buffer_size;
udp_buffer_pointer = udp_buffer;
}
}
return size;
}
bool Multicast::is_address_multicast(unsigned long address)
{
if((address & 255) >= 224 && (address & 255) <= 239) {
info->info("Address is multicast.");
return true;
}
info->info("Address is NOT multicast.");
return false;
}
/*
* open UDP socket
*/
bool Multicast::UDPOpen(const char *address, int port)
{
int enable = 1L;
struct sockaddr_in stAddr;
struct sockaddr_in stLclAddr;
struct hostent * host;
// int sock;
stAddr.sin_family = AF_INET;
stAddr.sin_port = htons(port);
if((host = gethostbyname(address)) == NULL) return false;
stAddr.sin_addr = *((struct in_addr *) host->h_addr_list[0]);
// Create a UDP socket
if((sock = socket(AF_INET, SOCK_DGRAM, 0)) < 0)
return false;
// Allow multiple instance of the client to share the same address and port
if(setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, (char *) &enable, sizeof(unsigned long int)) < 0)
return false;
// If the address is multicast, register to the multicast group
if(is_address_multicast(stAddr.sin_addr.s_addr)) {
struct ip_mreq stMreq;
// Bind the socket to port
stLclAddr.sin_family = AF_INET;
stLclAddr.sin_addr.s_addr = htonl(INADDR_ANY);
stLclAddr.sin_port = stAddr.sin_port;
if(bind(sock, (struct sockaddr*) & stLclAddr, sizeof(stLclAddr)) < 0) return false;
// Register to a multicast address
stMreq.imr_multiaddr.s_addr = stAddr.sin_addr.s_addr;
stMreq.imr_interface.s_addr = INADDR_ANY;
if(setsockopt(sock, IPPROTO_IP, IP_ADD_MEMBERSHIP, (char *) & stMreq, sizeof(stMreq)) < 0)
return false;
} else {
// Bind the socket to port
stLclAddr.sin_family = AF_INET;
stLclAddr.sin_addr.s_addr = htonl(INADDR_ANY);
stLclAddr.sin_port = htons(0);
if(bind(sock, (struct sockaddr*) & stLclAddr, sizeof(stLclAddr)) < 0)
return false;
}
connect(sock, (struct sockaddr*) & stAddr, sizeof(stAddr));
return true;
}
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