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/*
* syn
* Copyright (c) 2013-2017, Joshua Scoggins and Contributors
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR
* ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "ClipsExtensions.h"
#include "MemoryBlock.h"
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <unistd.h>
extern "C" {
#include "clips.h"
}
#ifdef PLATFORM_LINUX
#include "AlsaMIDIExtensions.h"
#endif // end PLATFORM_LINUX
#include <string>
bool socketNameSet = false;
std::string socketName;
bool serverSetup = false;
sockaddr_un server;
int socketId;
void setServerSocket(Environment* env, UDFContext* context, UDFValue* ret) noexcept;
void getServerSocket(Environment* env, UDFContext* context, UDFValue* ret) noexcept;
void setupConnection(Environment* env, UDFContext* context, UDFValue* ret) noexcept;
void shutdownConnection(Environment* env, UDFContext* context, UDFValue* ret) noexcept;
void readCommand(Environment* env, UDFContext* context, UDFValue* ret) noexcept;
void writeCommand(Environment* env, UDFContext* context, UDFValue* ret) noexcept;
void setupServerFunctions(Environment* env) noexcept {
socketNameSet = false;
socketName = "undefined";
serverSetup = false;
socketId = 0;
AddUDF(env, "set-socket-name", "b", 1, 1, "sy", setServerSocket, "setServerSocket", nullptr);
AddUDF(env, "get-socket-name", "sy", 0, 0, nullptr, getServerSocket, "getServerSocket", nullptr);
AddUDF(env, "setup-connection", "b", 0, 0, nullptr, setupConnection, "setupConnection", nullptr);
AddUDF(env, "read-command", "syb", 0, 0, nullptr, readCommand, "readCommand", nullptr);
AddUDF(env, "write-command", "syb", 1, 2, "sy;sy;sy", writeCommand, "writeCommand", nullptr);
AddUDF(env, "shutdown-connection", "b", 0, 0, nullptr, shutdownConnection, "shutdownConnection", nullptr);
//TODO: add shutdown connection
}
int main(int argc, char* argv[]) {
// make sure this is a common io bus
auto* mainEnv = CreateEnvironment();
// install features here
syn::installExtensions(mainEnv);
syn::installMemoryBlockTypes(mainEnv);
#ifdef PLATFORM_LINUX
syn::installAlsaMIDIExtensions(mainEnv);
#endif // end PLATFORM_LINUX
setupServerFunctions(mainEnv);
RerouteStdin(mainEnv, argc, argv);
CommandLoop(mainEnv);
DestroyEnvironment(mainEnv);
return -1;
}
void setServerSocket(Environment* env, UDFContext* context, UDFValue* ret) noexcept {
if (!socketNameSet) {
UDFValue name;
if (!UDFFirstArgument(context, LEXEME_BITS, &name)) {
syn::setBoolean(env, ret, false);
return;
}
socketName = syn::getLexeme(name);
socketNameSet = true;
syn::setBoolean(env, ret, true);
} else {
syn::setBoolean(env, ret, false);
}
}
void getServerSocket(Environment* env, UDFContext* context, UDFValue* ret) noexcept {
if (socketNameSet) {
syn::setString(env, ret, socketName);
} else {
syn::setString(env, ret, "undefined!");
}
}
void setupConnection(Environment* env, UDFContext* context, UDFValue* ret) noexcept {
if (socketNameSet && !serverSetup) {
socketId = socket(AF_UNIX, SOCK_STREAM, 0);
if (socketId < 0) {
clips::printRouter(env, STDERR, "Could not open stream socket!\n");
syn::setBoolean(env, ret, false);
return;
}
server.sun_family = AF_UNIX;
strcpy(server.sun_path, socketName.c_str());
if (bind(socketId, (sockaddr*)&server, sizeof(decltype(server)))) {
clips::printRouter(env, STDERR, "Could not bind stream socket!\n");
syn::setBoolean(env, ret, false);
return;
}
//TODO: add depth setting tracking
listen(socketId, 5);
serverSetup = true;
syn::setBoolean(env, ret, true);
} else {
syn::setBoolean(env, ret, false);
}
}
void shutdownConnection(Environment* env, UDFContext* context, UDFValue* ret) noexcept {
if (serverSetup) {
close(socketId);
unlink(socketName.c_str());
serverSetup = false;
socketNameSet = false;
socketId = -1;
syn::setBoolean(env, ret, true);
} else {
syn::setBoolean(env, ret, false);
}
}
void readCommand(Environment* env, UDFContext* context, UDFValue* ret) noexcept {
if (!serverSetup) {
syn::setBoolean(env, ret, false);
return;
}
std::stringstream collector;
auto msgsock = accept(socketId, 0, 0);
if (msgsock == -1) {
clips::printRouter(env, STDERR, "error during accept!\n");
syn::setBoolean(env, ret, false);
return;
}
constexpr auto bufSize = 65535;
char buf[bufSize]; // 64k
int rval = 0;
bool failed = false;
do {
bzero(buf, sizeof(buf));
rval = read(msgsock, buf, bufSize);
if (rval < 0) {
clips::printRouter(env, STDERR, "error reading stream message");
syn::setBoolean(env, ret, false);
failed = true;
break;
} else if (rval == 0) {
break;
} else {
std::string tmp(buf);
collector << tmp;
}
} while (rval > 0);
close(msgsock);
if (failed) {
syn::setBoolean(env, ret, false);
} else {
auto str = collector.str();
syn::setString(env, ret, str);
}
}
void writeCommand(Environment* env, UDFContext* context, UDFValue* ret) noexcept {
UDFValue destination, command;
if (!UDFFirstArgument(context, LEXEME_BITS, &destination)) {
syn::setBoolean(env, ret, false);
return;
} else if (!UDFNextArgument(context, LEXEME_BITS, &command)) {
syn::setBoolean(env, ret, false);
return;
}
std::string dest(syn::getLexeme(destination));
std::string cmd(syn::getLexeme(command));
auto sock = socket(AF_UNIX, SOCK_STREAM, 0);
if (sock < 0) {
clips::printRouter(env, STDERR, "Could not open stream socket\n");
syn::setBoolean(env, ret, false);
return;
}
sockaddr_un outboundServer;
outboundServer.sun_family = AF_UNIX;
strcpy(outboundServer.sun_path, dest.c_str());
if (connect(sock, (sockaddr*)&outboundServer, sizeof(sockaddr_un)) < 0) {
close(sock);
clips::printRouter(env, STDERR, "Could not connect to stream socket!\n");
syn::setBoolean(env, ret, false);
return;
}
if (write(sock, cmd.c_str(), cmd.length()) < 0) {
clips::printRouter(env, STDERR, "Could not write on stream socket!\n");
syn::setBoolean(env, ret, false);
} else {
syn::setBoolean(env, ret, true);
}
close(sock);
}