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/*
Copyright (C) 2005, 2006, 2007, 2008, 2009, 2010 Her Majesty the
Queen in Right of Canada (Communications Research Center Canada)
Copyright (C) 2017
Matthias P. Braendli, matthias.braendli@mpb.li
http://opendigitalradio.org
DESCRIPTION:
Abstraction for sockets.
*/
/*
This file is part of ODR-DabMod.
ODR-DabMod 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 3 of the
License, or (at your option) any later version.
ODR-DabMod 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 ODR-DabMod. If not, see <http://www.gnu.org/licenses/>.
*/
#pragma once
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
#include <unistd.h>
#include <cstdint>
#include <stdexcept>
#include <string>
#include <sys/socket.h>
#include <netinet/ip.h>
#include <errno.h>
#include <poll.h>
class TCPSocket {
public:
TCPSocket() {
if ((m_sock = socket(PF_INET, SOCK_STREAM, 0)) < 0) {
throw std::runtime_error("Can't create TCP socket");
}
#if defined(HAVE_SO_NOSIGPIPE)
int val = 1;
if (setsockopt(m_sock, SOL_SOCKET, SO_NOSIGPIPE,
&val, sizeof(val)) < 0) {
throw std::runtime_error("Can't set SO_NOSIGPIPE");
}
#endif
}
~TCPSocket() {
if (m_sock != -1) {
::close(m_sock);
}
}
TCPSocket(const TCPSocket& other) = delete;
TCPSocket& operator=(const TCPSocket& other) = delete;
TCPSocket(TCPSocket&& other) {
m_sock = other.m_sock;
if (other.m_sock != -1) {
other.m_sock = -1;
}
}
TCPSocket& operator=(TCPSocket&& other)
{
m_sock = other.m_sock;
if (other.m_sock != -1) {
other.m_sock = -1;
}
return *this;
}
bool valid(void) const {
return m_sock != -1;
}
void listen(int port) {
struct sockaddr_in addr;
addr.sin_family = AF_INET;
addr.sin_port = htons(port);
addr.sin_addr.s_addr = htonl(INADDR_ANY);
const int reuse = 1;
if (setsockopt(m_sock, SOL_SOCKET, SO_REUSEADDR,
&reuse, sizeof(reuse)) < 0) {
throw std::runtime_error("Can't reuse address for TCP socket");
}
if (::bind(m_sock, (struct sockaddr*)&addr, sizeof(addr)) < 0) {
close();
throw std::runtime_error("Can't bind TCP socket");
}
if (::listen(m_sock, 1) < 0) {
close();
m_sock = -1;
throw std::runtime_error("Can't listen TCP socket");
}
}
void close(void) {
::close(m_sock);
m_sock = -1;
}
TCPSocket accept_with_timeout(int timeout_ms, struct sockaddr_in *client)
{
struct pollfd fds[1];
fds[0].fd = m_sock;
fds[0].events = POLLIN | POLLOUT;
int retval = poll(fds, 1, timeout_ms);
if (retval == -1) {
throw std::runtime_error("TCP Socket accept error: " + std::to_string(errno));
}
else if (retval) {
socklen_t client_len = sizeof(struct sockaddr_in);
int sockfd = accept(m_sock, (struct sockaddr*)&client, &client_len);
TCPSocket s(sockfd);
return s;
}
else {
TCPSocket s(-1);
return s;
}
}
ssize_t sendall(const void *buffer, size_t buflen)
{
uint8_t *buf = (uint8_t*)buffer;
while (buflen > 0) {
/* On Linux, the MSG_NOSIGNAL flag ensures that the process
* would not receive a SIGPIPE and die.
* Other systems have SO_NOSIGPIPE set on the socket for the
* same effect. */
#if defined(HAVE_MSG_NOSIGNAL)
const int flags = MSG_NOSIGNAL;
#else
const int flags = 0;
#endif
ssize_t sent = ::send(m_sock, buf, buflen, flags);
if (sent < 0) {
return -1;
}
else {
buf += sent;
buflen -= sent;
}
}
return buflen;
}
ssize_t recv(void *buffer, size_t length, int flags)
{
return ::recv(m_sock, buffer, length, flags);
}
private:
explicit TCPSocket(int sockfd) {
m_sock = sockfd;
}
int m_sock = -1;
};
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