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authordeva <deva>2006-03-04 14:53:17 +0000
committerdeva <deva>2006-03-04 14:53:17 +0000
commitf02095ee5ceb78f1781a9e250693b8866ca42181 (patch)
tree7953c6b5f004f31ee9b340d7cdff5e85890594fc /server/multicast.cc
parent71c713dce2b5128862b293aa7fcc1d7ee89ffaf1 (diff)
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diff --git a/server/multicast.cc b/server/multicast.cc
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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>
+
+// 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");
+ write(sock, udp_buffer, udp_buffer_size);
+ 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;
+}