342 lines
8.7 KiB
C++
342 lines
8.7 KiB
C++
/*
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* Copyright (C) 2012-2017 Paul Davis <paul@linuxaudiosystems.com>
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* Copyright (C) 2013 John Emmas <john@creativepost.co.uk>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include <iostream>
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#include <cstdio>
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#include <fcntl.h>
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#include <errno.h>
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#include <stdlib.h>
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#include <string.h>
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#ifdef COMPILER_MSVC
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#undef O_NONBLOCK
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#define O_NONBLOCK 0
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#endif
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#if defined(PLATFORM_WINDOWS)
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#include <winsock2.h>
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#include <ws2tcpip.h>
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#else
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#include <netdb.h>
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#endif
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#if defined(PLATFORM_WINDOWS)
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typedef int socklen_t;
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#else
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#include <unistd.h>
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#include <sys/ioctl.h>
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inline void closesocket(int s) { ::close(s); }
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#endif
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#include "pbd/xml++.h"
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#include "pbd/error.h"
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#include "pbd/failed_constructor.h"
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#include "pbd/convert.h"
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#include "pbd/compose.h"
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#include "midi++/types.h"
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#include "midi++/ipmidi_port.h"
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#include "midi++/channel.h"
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using namespace MIDI;
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using namespace std;
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using namespace PBD;
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IPMIDIPort::IPMIDIPort (int base_port, const string& iface)
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: Port (string_compose ("IPmidi@%1", base_port), Port::Flags (Port::IsInput|Port::IsOutput))
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, sockin (-1)
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, sockout (-1)
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{
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if (!open_sockets (base_port, iface)) {
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throw (failed_constructor ());
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}
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}
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IPMIDIPort::IPMIDIPort (const XMLNode& node)
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: Port (node)
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{
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/* base class does not class set_state() */
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set_state (node);
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}
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IPMIDIPort::~IPMIDIPort ()
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{
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close_sockets ();
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}
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int
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IPMIDIPort::selectable () const
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{
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return sockin;
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}
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XMLNode&
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IPMIDIPort::get_state () const
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{
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return Port::get_state ();
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}
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void
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IPMIDIPort::set_state (const XMLNode& node)
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{
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Port::set_state (node);
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}
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void
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IPMIDIPort::close_sockets ()
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{
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if (sockin >= 0) {
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::closesocket (sockin);
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sockin = -1;
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}
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if (sockout >= 0) {
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::closesocket (sockout);
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sockout = -1;
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}
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}
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#ifndef PLATFORM_WINDOWS
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static bool
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get_address (int sock, struct in_addr *inaddr, const string& ifname )
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{
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// Get interface address from supplied name.
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struct ifreq ifr;
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::strncpy(ifr.ifr_name, ifname.c_str(), sizeof(ifr.ifr_name) - 1);
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if (::ioctl(sock, SIOCGIFFLAGS, (char *) &ifr)) {
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::perror("ioctl(SIOCGIFFLAGS)");
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return false;
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}
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if ((ifr.ifr_flags & IFF_UP) == 0) {
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error << string_compose ("interface %1 is down", ifname) << endmsg;
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return false;
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}
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if (::ioctl(sock, SIOCGIFADDR, (char *) &ifr)) {
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::perror("ioctl(SIOCGIFADDR)");
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return false;
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}
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struct sockaddr_in sa;
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::memcpy(&sa, &ifr.ifr_addr, sizeof(struct sockaddr_in));
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inaddr->s_addr = sa.sin_addr.s_addr;
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return true;
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}
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#endif
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bool
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IPMIDIPort::open_sockets (int base_port, const string& ifname)
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{
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int protonum = 0;
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struct protoent *proto = ::getprotobyname("IP");
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if (proto) {
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protonum = proto->p_proto;
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}
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sockin = ::socket (PF_INET, SOCK_DGRAM, protonum);
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if (sockin < 0) {
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::perror("socket(in)");
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return false;
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}
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struct sockaddr_in addrin;
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::memset(&addrin, 0, sizeof(addrin));
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addrin.sin_family = AF_INET;
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addrin.sin_addr.s_addr = htonl(INADDR_ANY);
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addrin.sin_port = htons(base_port);
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if (::bind(sockin, (struct sockaddr *) (&addrin), sizeof(addrin)) < 0) {
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::perror("bind");
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return false;
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}
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// Will Hall, 2007
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// INADDR_ANY will bind to default interface,
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// specify alternate interface nameon which to bind...
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struct in_addr if_addr_in;
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#ifndef PLATFORM_WINDOWS
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if (!ifname.empty()) {
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if (!get_address(sockin, &if_addr_in, ifname)) {
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error << string_compose ("socket(in): could not find interface address for %1", ifname) << endmsg;
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return false;
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}
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if (::setsockopt(sockin, IPPROTO_IP, IP_MULTICAST_IF,
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(char *) &if_addr_in, sizeof(if_addr_in))) {
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::perror("setsockopt(IP_MULTICAST_IF)");
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return false;
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}
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} else {
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if_addr_in.s_addr = htonl (INADDR_ANY);
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}
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#else
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if_addr_in.s_addr = htonl (INADDR_ANY);
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#endif
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struct ip_mreq mreq;
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mreq.imr_multiaddr.s_addr = ::inet_addr("225.0.0.37"); /* ipMIDI group multicast address */
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mreq.imr_interface.s_addr = if_addr_in.s_addr;
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if(::setsockopt (sockin, IPPROTO_IP, IP_ADD_MEMBERSHIP, (char *) &mreq, sizeof(mreq)) < 0) {
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::perror("setsockopt(IP_ADD_MEMBERSHIP)");
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fprintf(stderr, "socket(in): your kernel is probably missing multicast support.\n");
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return false;
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}
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// Output socket...
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sockout = ::socket (AF_INET, SOCK_DGRAM, protonum);
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if (sockout < 0) {
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::perror("socket(out)");
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return false;
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}
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// Will Hall, Oct 2007
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#ifndef PLATFORM_WINDOWS
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if (!ifname.empty()) {
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struct in_addr if_addr_out;
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if (!get_address(sockout, &if_addr_out, ifname)) {
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error << string_compose ("socket(out): could not find interface address for %1", ifname) << endmsg;
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return false;
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}
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if (::setsockopt(sockout, IPPROTO_IP, IP_MULTICAST_IF, (char *) &if_addr_out, sizeof(if_addr_out))) {
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::perror("setsockopt(IP_MULTICAST_IF)");
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return false;
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}
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}
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#endif
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::memset(&addrout, 0, sizeof(struct sockaddr_in));
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addrout.sin_family = AF_INET;
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addrout.sin_addr.s_addr = ::inet_addr("225.0.0.37");
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addrout.sin_port = htons (base_port);
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// Turn off loopback...
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int loop = 0;
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#ifdef PLATFORM_WINDOWS
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/* https://msdn.microsoft.com/en-us/library/windows/desktop/ms739161%28v=vs.85%29.aspx
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*
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* ------------------------------------------------------------------------------
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* Note The Winsock version of the IP_MULTICAST_LOOP option is
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* semantically different than the UNIX version of the
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* IP_MULTICAST_LOOP option:
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*
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* In Winsock, the IP_MULTICAST_LOOP option applies only to the receive path.
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* In the UNIX version, the IP_MULTICAST_LOOP option applies to the send path.
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*
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* For example, applications ON and OFF (which are easier to track than
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* X and Y) join the same group on the same interface; application ON
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* sets the IP_MULTICAST_LOOP option on, application OFF sets the
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* IP_MULTICAST_LOOP option off. If ON and OFF are Winsock
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* applications, OFF can send to ON, but ON cannot sent to OFF. In
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* contrast, if ON and OFF are UNIX applications, ON can send to OFF,
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* but OFF cannot send to ON.
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* ------------------------------------------------------------------------------
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*
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* Alles klar? Gut!
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*/
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const int target_sock = sockin;
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#else
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const int target_sock = sockout;
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#endif
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if (::setsockopt (target_sock, IPPROTO_IP, IP_MULTICAST_LOOP, (char *) &loop, sizeof (loop)) < 0) {
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::perror("setsockopt(IP_MULTICAST_LOOP)");
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return false;
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}
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#ifndef PLATFORM_WINDOWS
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if (fcntl (sockin, F_SETFL, O_NONBLOCK)) {
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error << "cannot set non-blocking mode for IP MIDI input socket (" << ::strerror (errno) << ')' << endmsg;
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return false;
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}
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if (fcntl (sockout, F_SETFL, O_NONBLOCK)) {
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error << "cannot set non-blocking mode for IP MIDI output socket (" << ::strerror (errno) << ')' << endmsg;
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return false;
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}
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#else
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// If imode !=0, non-blocking mode is enabled.
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u_long mode=1;
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if (ioctlsocket(sockin,FIONBIO,&mode)) {
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error << "cannot set non-blocking mode for IP MIDI input socket (" << ::strerror (errno) << ')' << endmsg;
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return false;
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}
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mode = 1; /* just in case it was modified in the previous call */
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if (ioctlsocket(sockout,FIONBIO,&mode)) {
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error << "cannot set non-blocking mode for IP MIDI output socket (" << ::strerror (errno) << ')' << endmsg;
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return false;
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}
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#endif
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return true;
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}
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int
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IPMIDIPort::write (const MIDI::byte* msg, size_t msglen, timestamp_t /* ignored */) {
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if (sockout) {
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Glib::Threads::Mutex::Lock lm (write_lock);
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if (::sendto (sockout, (const char *) msg, msglen, 0, (struct sockaddr *) &addrout, sizeof(struct sockaddr_in)) < 0) {
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::perror("sendto");
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return -1;
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}
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return msglen;
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}
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return 0;
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}
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int
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IPMIDIPort::read (MIDI::byte* /*buf*/, size_t /*bufsize*/)
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{
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/* nothing to do here - all handled by parse() */
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return 0;
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}
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void
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IPMIDIPort::parse (samplecnt_t timestamp)
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{
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/* input was detected on the socket, so go get it and hand it to the
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* parser. This will emit appropriate signals that will be handled
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* by anyone who cares.
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*/
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unsigned char buf[1024];
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struct sockaddr_in sender;
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socklen_t slen = sizeof(sender);
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int r = ::recvfrom (sockin, (char *) buf, sizeof(buf), 0, (struct sockaddr *) &sender, &slen);
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if (r >= 0) {
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_parser->set_timestamp (timestamp);
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for (int i = 0; i < r; ++i) {
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_parser->scanner (buf[i]);
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}
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} else {
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::perror ("failed to recv from socket");
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}
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}
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