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/*
* Copyright 2003-2017 The Music Player Daemon Project
* http://www.musicpd.org
*
* This program 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.
*
* This program 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 this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include "config.h"
#include "Listen.hxx"
#include "client/Client.hxx"
#include "config/Param.hxx"
#include "config/ConfigGlobal.hxx"
#include "config/ConfigOption.hxx"
#include "net/SocketAddress.hxx"
#include "net/UniqueSocketDescriptor.hxx"
#include "event/ServerSocket.hxx"
#include "system/Error.hxx"
#include "util/RuntimeError.hxx"
#include "util/Domain.hxx"
#include "fs/AllocatedPath.hxx"
#include "Log.hxx"
#include <string.h>
#include <assert.h>
#ifdef ENABLE_SYSTEMD_DAEMON
#include <systemd/sd-daemon.h>
#endif
static constexpr Domain listen_domain("listen");
#define DEFAULT_PORT 6600
class ClientListener final : public ServerSocket {
Partition &partition;
public:
ClientListener(EventLoop &_loop, Partition &_partition)
:ServerSocket(_loop), partition(_partition) {}
private:
void OnAccept(UniqueSocketDescriptor fd,
SocketAddress address, int uid) override {
client_new(GetEventLoop(), partition,
std::move(fd), address, uid);
}
};
static ClientListener *listen_socket;
int listen_port;
/**
* Throws #std::runtime_error on error.
*/
static void
listen_add_config_param(unsigned int port,
const ConfigParam *param)
{
assert(param != nullptr);
if (0 == strcmp(param->value.c_str(), "any")) {
listen_socket->AddPort(port);
} else if (param->value[0] == '/' || param->value[0] == '~') {
listen_socket->AddPath(param->GetPath());
} else {
listen_socket->AddHost(param->value.c_str(), port);
}
}
#ifdef ENABLE_SYSTEMD_DAEMON
static bool
listen_systemd_activation()
{
int n = sd_listen_fds(true);
if (n <= 0) {
if (n < 0)
throw MakeErrno(-n, "sd_listen_fds() failed");
return false;
}
for (int i = SD_LISTEN_FDS_START, end = SD_LISTEN_FDS_START + n;
i != end; ++i)
listen_socket->AddFD(i);
return true;
}
#endif
void
listen_global_init(EventLoop &loop, Partition &partition)
{
int port = config_get_positive(ConfigOption::PORT, DEFAULT_PORT);
const auto *param = config_get_param(ConfigOption::BIND_TO_ADDRESS);
listen_socket = new ClientListener(loop, partition);
#ifdef ENABLE_SYSTEMD_DAEMON
if (listen_systemd_activation())
return;
#endif
if (param != nullptr) {
/* "bind_to_address" is configured, create listeners
for all values */
do {
try {
listen_add_config_param(port, param);
} catch (...) {
delete listen_socket;
std::throw_with_nested(FormatRuntimeError("Failed to listen on %s (line %i)",
param->value.c_str(),
param->line));
}
} while ((param = param->next) != nullptr);
} else {
/* no "bind_to_address" configured, bind the
configured port on all interfaces */
try {
listen_socket->AddPort(port);
} catch (...) {
delete listen_socket;
std::throw_with_nested(FormatRuntimeError("Failed to listen on *:%d: ", port));
}
}
try {
listen_socket->Open();
} catch (...) {
delete listen_socket;
throw;
}
listen_port = port;
}
void listen_global_finish(void)
{
LogDebug(listen_domain, "listen_global_finish called");
assert(listen_socket != nullptr);
delete listen_socket;
}
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