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/*
* Copyright (c) 2016 Samsung Electronics Co., Ltd All Rights Reserved
*
* 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
*/
/*
* @file socket.cpp
* @author Kyungwook Tak (k.tak@samsung.com)
* @version 1.0
* @brief
*/
#include "common/socket.h"
#include <sys/socket.h>
#include <sys/stat.h>
#include <sys/un.h>
#include <unistd.h>
#include <systemd/sd-daemon.h>
#include "common/audit/logger.h"
#include "common/exception.h"
namespace Csr {
namespace {
int g_sd_listen_fds = -1;
int createSystemdSocket(const std::string &path)
{
if (g_sd_listen_fds == -1)
g_sd_listen_fds = ::sd_listen_fds(0);
if (g_sd_listen_fds < 0)
ThrowExc(CSR_ERROR_SOCKET, "failed to sd_listen_fds");
for (int fd = SD_LISTEN_FDS_START; fd < SD_LISTEN_FDS_START + g_sd_listen_fds; ++fd) {
if (::sd_is_socket_unix(fd, SOCK_STREAM, 1, path.c_str(), 0) > 0) {
INFO("service's systemd socket found with fd: " << fd);
return fd;
}
}
ThrowExc(CSR_ERROR_SOCKET, "No useable socket were passed by systemd. path: " << path);
}
} // namespace anonymous
Socket Socket::create(SockId sockId, Socket::Type type)
{
switch (type) {
case Socket::Type::SERVER:
return Socket(sockId);
case Socket::Type::CLIENT:
return Socket::connect(sockId);
default:
ThrowExc(CSR_ERROR_SOCKET, "Invalid type to Socket::create");
}
}
Socket::Socket(SockId sockId, int fd) : m_sockId(sockId), m_fd(fd)
{
if (this->m_fd < 0)
ThrowExc(CSR_ERROR_SOCKET, "Socket fd from constructor is invalid!!");
}
Socket::Socket(SockId sockId) : m_sockId(sockId)
{
this->m_fd = createSystemdSocket(getSockDesc(this->m_sockId).path);
}
Socket::Socket(Socket &&other) noexcept : m_sockId(other.m_sockId), m_fd(other.m_fd)
{
other.m_fd = 0;
}
Socket &Socket::operator=(Socket &&other) noexcept
{
if (this == &other)
return *this;
this->m_sockId = other.m_sockId;
this->m_fd = other.m_fd;
other.m_fd = 0;
return *this;
}
Socket::~Socket()
{
if (this->m_fd == 0)
return;
INFO("Close socket of fd: " << this->m_fd);
::close(m_fd);
}
Socket Socket::accept(void) const
{
int fd = ::accept(this->m_fd, nullptr, nullptr);
if (fd < 0)
ThrowExc(CSR_ERROR_SOCKET, "socket on fd[" << this->m_fd << "] accept failed "
"with errno: " << errno);
INFO("Accept client success with fd: " << fd);
return Socket(this->m_sockId, fd);
}
Socket Socket::connect(SockId sockId)
{
const auto &path = getSockDesc(sockId).path;
if (path.size() >= sizeof(sockaddr_un::sun_path))
ThrowExc(CSR_ERROR_SERVER, "socket path size too long!");
int fd = ::socket(AF_UNIX, SOCK_STREAM, 0);
if (fd < 0)
ThrowExc(CSR_ERROR_SOCKET, "Socket create failed with errno: " << errno);
sockaddr_un addr;
addr.sun_family = AF_UNIX;
strncpy(addr.sun_path, path.c_str(), sizeof(addr.sun_path));
if (::connect(fd, reinterpret_cast<sockaddr *>(&addr),
sizeof(sockaddr_un)) == -1)
ThrowExc(CSR_ERROR_SOCKET, "Socket[" << path << "] connect failed "
"with errno: " << errno);
INFO("Connect to CSR server success with fd:" << fd);
return Socket(sockId, fd);
}
SockId Socket::getSockId(void) const noexcept
{
return this->m_sockId;
}
int Socket::getFd(void) const noexcept
{
return this->m_fd;
}
RawBuffer Socket::read(void) const
{
size_t total = 0;
size_t size = 0;
auto bytes = ::read(this->m_fd, &size, sizeof(size));
if (bytes < 0)
ThrowExc(CSR_ERROR_SOCKET, "Socket data size read failed on fd[" << this->m_fd <<
"] with errno: " << errno);
RawBuffer data(size, 0);
auto buf = reinterpret_cast<char *>(data.data());
while (total < size) {
bytes = ::read(this->m_fd, buf + total, size - total);
if (bytes < 0) {
if (errno == EAGAIN || errno == EWOULDBLOCK || errno == EINTR)
continue;
else
ThrowExc(CSR_ERROR_SOCKET, "Socket read failed on fd[" << this->m_fd <<
"] with errno: " << errno);
}
total += bytes;
}
data.resize(total);
DEBUG("Read data of size[" << total
<< "] from stream on socket fd[" << this->m_fd << "] done.");
return data;
}
void Socket::write(const RawBuffer &data) const
{
size_t total = 0;
auto buf = reinterpret_cast<const char *>(data.data());
auto size = data.size();
auto bytes = ::write(this->m_fd, &size, sizeof(size));
if (bytes < 0)
ThrowExc(CSR_ERROR_SOCKET, "Socket data size write failed on fd[" << this->m_fd <<
"] with errno: " << errno);
while (total < size) {
bytes = ::write(this->m_fd, buf + total, size - total);
if (bytes < 0) {
if (errno == EAGAIN || errno == EWOULDBLOCK || errno == EINTR)
continue;
else
ThrowExc(CSR_ERROR_SOCKET, "Socket write failed on fd[" << this->m_fd <<
"] with errno: " << errno);
}
total += bytes;
}
DEBUG("Write data of size[" << total <<
"] to stream on socket fd[" << this->m_fd << "] done.");
}
}
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