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/* - mode: c; c-basic-offset: 2; indent-tabs-mode: nil; -*-
* vim:expandtab:shiftwidth=2:tabstop=2:smarttab:
*
* Copyright (C) 2010 Brian Aker
*
* 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 St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <config.h>
#include <drizzled/gettext.h>
#include <drizzled/error.h>
#include <drizzled/session.h>
#include <drizzled/internal/my_sys.h>
#include <drizzled/internal/m_string.h>
#include <algorithm>
#include <iostream>
#include <boost/program_options.hpp>
#include <boost/filesystem.hpp>
#include <drizzled/module/option_map.h>
#include <sys/un.h>
#include <plugin/mysql_unix_socket_protocol/protocol.h>
#define DRIZZLE_UNIX_SOCKET_PATH "/tmp/mysql.socket"
namespace po= boost::program_options;
namespace fs= boost::filesystem;
using namespace drizzled;
using namespace std;
namespace drizzle_plugin {
namespace mysql_unix_socket_protocol {
static bool clobber= false;
ProtocolCounters Protocol::mysql_unix_counters;
Protocol::~Protocol()
{
fs::remove(_unix_socket_path);
}
in_port_t Protocol::getPort() const
{
return 0;
}
extern "C" {
char at_exit_socket_file[1024 * 4]= { 0 };
static void remove_socket_file(void)
{
if (at_exit_socket_file[0])
{
if (unlink(at_exit_socket_file) == -1)
{
std::cerr << "Could not remove socket: " << at_exit_socket_file << "(" << strerror(errno) << ")" << std::endl;
}
at_exit_socket_file[0]= 0;
}
}
}
static int init(drizzled::module::Context &context)
{
const module::option_map &vm= context.getOptions();
fs::path uds_path(vm["path"].as<fs::path>());
if (not fs::exists(uds_path))
{
Protocol *listen_obj= new Protocol("mysql_unix_socket_protocol", uds_path);
listen_obj->addCountersToTable();
context.add(listen_obj);
context.registerVariable(new sys_var_const_string_val("path", fs::system_complete(uds_path).file_string()));
context.registerVariable(new sys_var_bool_ptr_readonly("clobber", &clobber));
context.registerVariable(new sys_var_uint32_t_ptr("max-connections", &Protocol::mysql_unix_counters.max_connections));
snprintf(at_exit_socket_file, sizeof(at_exit_socket_file), "%s", uds_path.file_string().c_str());
atexit(remove_socket_file);
}
else
{
cerr << uds_path << _(" exists already. Do you have another Drizzle or "
"MySQL running? Or perhaps the file is stale and "
"should be removed?") << std::endl;
return 0;
}
return 0;
}
bool Protocol::getFileDescriptors(std::vector<int> &fds)
{
int unix_sock= socket(AF_UNIX, SOCK_STREAM, 0);
if (unix_sock < 0)
{
std::cerr << "Can't start server : UNIX Socket";
return false;
}
// In case we restart and find something in our way we move it aside and
// then attempt to remove it.
if (clobber)
{
fs::path move_file(_unix_socket_path.file_string() + ".old");
fs::rename(_unix_socket_path, move_file);
unlink(move_file.file_string().c_str());
}
int arg= 1;
(void) setsockopt(unix_sock, SOL_SOCKET, SO_REUSEADDR, (char*)&arg, sizeof(arg));
unlink(_unix_socket_path.file_string().c_str());
sockaddr_un servAddr;
memset(&servAddr, 0, sizeof(servAddr));
servAddr.sun_family= AF_UNIX;
if (_unix_socket_path.file_string().size() > sizeof(servAddr.sun_path))
{
std::cerr << "Unix Socket Path length too long. Must be under "
<< sizeof(servAddr.sun_path) << " bytes." << endl;
return false;
}
memcpy(servAddr.sun_path, _unix_socket_path.file_string().c_str(), min(sizeof(servAddr.sun_path)-1,_unix_socket_path.file_string().size()));
socklen_t addrlen= sizeof(servAddr);
if (::bind(unix_sock, reinterpret_cast<sockaddr *>(&servAddr), addrlen) < 0)
{
std::cerr << "Can't start server : Bind on unix socket." << std::endl;
std::cerr << "Do you already have another of drizzled or mysqld running on socket: " << _unix_socket_path << "?" << std::endl;
std::cerr << "Can't start server : UNIX Socket" << std::endl;
return false;
}
if (listen(unix_sock, (int) 1000) < 0)
{
std::cerr << "listen() on Unix socket failed with error " << errno << "\n";
}
else
{
errmsg_printf(error::INFO, _("Listening on %s"), _unix_socket_path.file_string().c_str());
}
fds.push_back(unix_sock);
return false;
}
plugin::Client *Protocol::getClient(int fd)
{
int new_fd= acceptTcp(fd);
return new_fd == -1 ? NULL : new ClientMySQLProtocol(new_fd, getCounters());
}
static void init_options(drizzled::module::option_context &context)
{
context("path",
po::value<fs::path>()->default_value(DRIZZLE_UNIX_SOCKET_PATH),
_("Path used for MySQL UNIX Socket Protocol."));
context("clobber",
_("Clobber socket file if one is there already."));
context("max-connections",
po::value<uint32_t>(&Protocol::mysql_unix_counters.max_connections)->default_value(1000),
_("Maximum simultaneous connections."));
}
} /* namespace mysql_unix_socket_protocol */
} /* namespace drizzle_plugin */
DRIZZLE_DECLARE_PLUGIN
{
DRIZZLE_VERSION_ID,
"mysql_unix_socket_protocol",
"0.3",
"Brian Aker",
N_("MySQL Unix socket protocol"),
PLUGIN_LICENSE_GPL,
drizzle_plugin::mysql_unix_socket_protocol::init,
NULL,
drizzle_plugin::mysql_unix_socket_protocol::init_options,
}
DRIZZLE_DECLARE_PLUGIN_END;
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