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/* ------------------------------------------------------------------
* Copyright (C) 2020 Matthias P. Braendli
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either
* express or implied.
* See the License for the specific language governing permissions
* and limitations under the License.
* -------------------------------------------------------------------
*/
#include "config.h"
#include "PadInterface.h"
#include <stdexcept>
#include <sstream>
#include <cstring>
#include <cerrno>
#include <cassert>
#include <sys/socket.h>
#include <sys/un.h>
#include <fcntl.h>
#include <unistd.h>
#define MESSAGE_REQUEST 1
#define MESSAGE_PAD_DATA 2
using namespace std;
void PadInterface::open(const std::string& pad_ident)
{
m_pad_ident = pad_ident;
m_sock = ::socket(AF_UNIX, SOCK_DGRAM, 0);
if (m_sock == -1) {
throw runtime_error("PAD socket creation failed: " + string(strerror(errno)));
}
int flags = fcntl(m_sock, F_GETFL);
if (flags == -1) {
std::string errstr(strerror(errno));
throw std::runtime_error("TCP: Could not get socket flags: " + errstr);
}
if (fcntl(m_sock, F_SETFL, flags | O_NONBLOCK) == -1) {
std::string errstr(strerror(errno));
throw std::runtime_error("TCP: Could not set O_NONBLOCK: " + errstr);
}
struct sockaddr_un claddr;
memset(&claddr, 0, sizeof(struct sockaddr_un));
claddr.sun_family = AF_UNIX;
snprintf(claddr.sun_path, sizeof(claddr.sun_path), "/tmp/%s.audioenc", m_pad_ident.c_str());
if (unlink(claddr.sun_path) == -1 and errno != ENOENT) {
fprintf(stderr, "Unlinking of socket %s failed: %s\n", claddr.sun_path, strerror(errno));
}
const auto ret = ::bind(m_sock, (const struct sockaddr *) &claddr, sizeof(struct sockaddr_un));
if (ret == -1) {
throw runtime_error("PAD socket bind failed " + string(strerror(errno)));
}
}
vector<uint8_t> PadInterface::request(uint8_t padlen)
{
if (m_pad_ident.empty()) {
throw logic_error("Uninitialised PadInterface::request() called");
}
// Sending requests allows the PadEnc to know both the padlen, but also
// will allow proper timing.
uint8_t packet[2];
packet[0] = MESSAGE_REQUEST; // Message type, to allow future expansion
packet[1] = padlen;
struct sockaddr_un claddr;
memset(&claddr, 0, sizeof(struct sockaddr_un));
claddr.sun_family = AF_UNIX;
snprintf(claddr.sun_path, sizeof(claddr.sun_path), "/tmp/%s.padenc", m_pad_ident.c_str());
ssize_t ret = ::sendto(m_sock, packet, sizeof(packet), 0, (struct sockaddr*)&claddr, sizeof(struct sockaddr_un));
if (ret == -1) {
// This suppresses the -Wlogical-op warning
if (errno == EAGAIN
#if EAGAIN != EWOULDBLOCK
or errno == EWOULDBLOCK
#endif
or errno == ECONNREFUSED
or errno == ENOENT) {
if (m_padenc_reachable) {
fprintf(stderr, "ODR-PadEnc at %s not reachable\n", claddr.sun_path);
m_padenc_reachable = false;
}
}
else {
fprintf(stderr, "PAD request send failed: %s\n", strerror(errno));
}
}
else if (ret != sizeof(packet)) {
fprintf(stderr, "PAD request incorrect length sent: %zu bytes of %zu transmitted\n",
ret, sizeof(packet));
}
else if (not m_padenc_reachable) {
fprintf(stderr, "ODR-PadEnc is now reachable at %s\n", claddr.sun_path);
m_padenc_reachable = true;
}
vector<uint8_t> buffer(2048);
while (true) {
ret = ::recvfrom(m_sock, buffer.data(), buffer.size(), 0, nullptr, nullptr);
if (ret == -1) {
// This suppresses the -Wlogical-op warning
#if EAGAIN == EWOULDBLOCK
if (errno != EAGAIN)
#else
if (not (errno == EAGAIN or errno == EWOULDBLOCK))
#endif
{
throw runtime_error(string("Can't receive data: ") + strerror(errno));
}
return {};
}
else if (ret > 0) {
buffer.resize(ret);
// We could check where the data comes from, but since we're using UNIX sockets
// the source is anyway local to the machine.
if (buffer[0] == MESSAGE_PAD_DATA) {
vector<uint8_t> pad_data(buffer.size() - 1);
copy(buffer.begin() + 1, buffer.end(), pad_data.begin());
return pad_data;
}
else {
continue;
}
}
}
}
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